Wikipedia talk:WikiProject Chemicals/Archive 2010

Archived discussion of WT:Chem in 2010

Merge oxalate and oxalic acid at Talk:oxalic acid

An determined and now slightly bitter editor User:Yappy2bhere has proposed the merger of oxalate and oxalic acid. I removed the tags, explaining that we have "much precedent for separate articles acids and conjugate bases and elements and their redox partners" But the editor is determined to see this merger discussion play out, so experienced editors are encouraged to communicate at Talk:oxalic acid on the advisability of the merger. The we need to write this down in our MOS.--Smokefoot (talk) 14:53, 16 January 2010 (UTC)[reply]

WP 1.0 bot announcement

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Deletion discussion

Two chemical articles, claimed to be hoaxes, are up for deletion at Wikipedia:Articles for deletion/ICA (4-Icaroldichloridesulphate aka Icarus). Input from additional chemists would be helpful. -- Ed (Edgar181) 15:02, 28 January 2010 (UTC)[reply]

New nuclear chemicals

I found a few new articles about chemicals related to the nuclear industry, I will have a look later, but helping hands are welcome. Plutonium-gallium alloy, Uranium hydride, AlSiC, Barium borate and Dymalloy. Thanks. --Stone (talk) 11:46, 7 February 2010 (UTC)[reply]

List of highly toxic gases = OR and should be deleted?

I tagged this article as being original research. Advice welcome because possibly I am missing something

who decided that these gases are toxic?
who decided that these gases represent a problem. H₂Te is highly unstable at room temperature, and how often does one encounter dichloroacetylene?
who decides on what qualifies as a gas? hexachlorobutadiene is listed (boiling point = 210 °C)

Comments welcome.--Smokefoot (talk) 17:07, 7 February 2010 (UTC)[reply]

May also show a non-worldwide view - all the data is US, not sure how well EU limits and other countries limits would compare. Bromine is also a liquid, it is therefore going to add all low boiling liquids to it? What criteria decides when a "gas" is toxic enough to be included? May also give a false impression if some things are omitted - e.g It's not in the list so it's not that bad - just pass me the dimethyl sulphate... Ronhjones ^(Talk) 01:45, 25 February 2010 (UTC)[reply]

Lanthanide, actinide vs. lanthanoid, actinoid

IUPAC uses the latter and some editors have been changing everything to that standard. However a little searching tells me that actual adoption of the -oid names is low. --JWB (talk) 23:24, 9 February 2010 (UTC)[reply]

Just for a start, a mass changeover without discussion here is certainly unhelpful. Please feel free to invite the editors who are trying to the mass changeover to discuss things here first. The question of how far we follow (or not) IUPAC nomenclature has often been a source of contention (in both directions), and has even been the subject of comment (in both directions) from senior members of the IUPAC committees concerned! But let's just keep the debate to the subject in question: do we say "lanthanide", do we say "lanthanoid", or do we say both (one or the other depending on the author)? Physchim62 (talk) 02:55, 10 February 2010 (UTC)[reply]

Lanthanide, mainly because that term is most commonly used by chemists and materials people (and partly to resist the nomenclature police).--Smokefoot (talk) 03:25, 10 February 2010 (UTC)[reply]

I would second that - lanthanoid is rarely used, no matter how official it is, and we know many examples of official terms which have not been adopted by scientists. Materialscientist (talk) 03:30, 10 February 2010 (UTC)[reply]

There has been dicussion about moving the pages on the Actinoid and lanthanoid talk pages, these moves were completed literally years ago and there has been plenty of time for discussion. All I have done recently is change the wikilinks from "what links here" regarding the pages Actinide and Lanthanide that were moved some time ago, which is standard procedure following page moves I believe but wasn't done at the time. I was acting in good faith and was simply clearing up two old page moves. I certainly wasn't trying to pull the wool over anybody's eyes and reject that I was trying to make a mass changeover without discussion. Admittedely I did also move the page Lanthanoid contraction but one page doesn't consitute a mass changeover. I take full responsibility for my edits and if IUPAC convention is rejected then I will of course undo all of my actions. I favour the IUPAC convention and have seen it used. Although I think it is fair to say that academic journals do not appear to have updated their own MOS in keeping with the change. The wikipedia periodic table currently uses the IUPAC convention as does the webelements website. Jdrewitt (talk) 07:21, 10 February 2010 (UTC)[reply]

I myself would also use 'lanthanide' for these terms, and if I look through the comments in this thread, it looks like that is the common way around (small pool, but IIRC I see an American, some people in Europe and an Australian (???) editor commenting. We have here in chemistry generally said 'use the name that is commonly used', not the official one (exceptions when there is multiple use of the same term (XTC, MDMA), etc. etc.), and let redirects do the work for those who do search for the IUPAC term.

Don't worry, Jdrewitt, lets discuss and see where it goes. Bold changes can indeed be undone, no harm done. --Dirk Beetstra ^{T C} 08:12, 10 February 2010 (UTC)[reply]

I appreciate the good faith efforts to update to what is billed as the most modern terminology, but the difference in search counts was so great it surprised me, for example Google Scholar lanthanide: 165,000, lanthanoid: 6,680, actinide: 78,700, actinoid: 1,640. --JWB (talk) 11:45, 10 February 2010 (UTC)[reply]

How does this comparison look when you compare articles published since the IUPAC nomenclature change? I'm not sure what year this was although I think it was fairly recent perhaps 2005? Jdrewitt (talk) 11:51, 10 February 2010 (UTC)[reply]

The -oid endings have been around since at least the 1990 Recommendations, although the wording was made stronger ("lanthanoid and actinoid are preferred to lanthanide and actinide") in the 2005 Recommendations. Physchim62 (talk) 12:00, 10 February 2010 (UTC)[reply]

I checked, google scholar reports reports 15,400 hits for Lanthanide and 1710 for Lanthanoid for articles published since 2005. Hence Lanthanoid is used 10% of the time. This is an increase from 4% of the share from the figures stated above which presumably includes all years. So although -oid may not be the most common term it does appear to be increasing in usage. There doesn't appear to be a change in the usage of actinide yet. Jdrewitt (talk) 12:05, 10 February 2010 (UTC)[reply]

A check of lanthanide vs lanthanoid in titles in the American Chem. Soc. journal Inorganic Chemistry: lanthanide: 570 vs 24 for lanthanoid. --Smokefoot (talk) 14:04, 10 February 2010 (UTC)[reply]

For what years? If the use of -oid is becoming more commonplace then it will be more abundant in recent articles vs. older onse, as google scholar seems to show (which covers all journals). Jdrewitt (talk) 14:09, 10 February 2010 (UTC)[reply]

Inorg Chem has been published since 1963. Lanthanoid first appeared in 2 titles in 1980, it was used once in 2010. Lanthanide was used in 8 titles in 2010. I didnt check but I assume that it has been used throughout the 48 years of this journal. --Smokefoot (talk) 14:30, 10 February 2010 (UTC)[reply]

Ok so that'll be 11% then in 2010! My point though was that although -oid is not the most common terminology, its use does appear to be increasing. I'm not certain whether academics are intentionally ignoring IUPAC convention or just unaware of it. Jdrewitt (talk) 14:56, 10 February 2010 (UTC)[reply]

I publish lanthanide and actinide, and it is significantly more common in the biased subset of papers on my computer. I vaguely prefer -oid for here; unless and until it actually becomes more common, I would be fine with asserting WP:COMMONNAME to go back to -ide. Please let me know if you would like me to move actinoid, as I am not sure if the software counts the move vandalism here as non-trivial history. - 2/0 (cont.) 17:22, 10 February 2010 (UTC)[reply]

The discussion above points to lanthanide over lanthanoid and, by inference, actinide over actinoid. When the -oid naming might become dominant, which might not be soon, we should revisit the issue. --Smokefoot (talk) 18:24, 10 February 2010 (UTC)[reply]

It's not quite as simple as simply moving back. There are articles such as Periodic table which use the IUPAC nomenclature and I'm sure the people there would like to make some input first. Changing the article titles would also mean universally changing all references of -oid. I'm not saying this shouldn't be done, just that these things need to be considered first. The articles were moved several years back, I don't see any need for haste. Also, if the moves are made what do we say in the lead, we have to acknowledge the IUPAC nomenclature. Instead of writing Lanthanoid (formally lanthanide) should we write something like Lanthanide (also lanthanoid per IUPAC nomenclature)? Jdrewitt (talk) 18:45, 10 February 2010 (UTC)[reply]

Yes, inevitably there will be lots of clean-up and possibly some automated method could be devised to search and replace the oid, assuming that the consensus continues to flow in the current direction. It is difficult to understand how this obscure term ever got inserted so often, but it's too late to complain. Per our tradition (but apparently not in our Chem manual of style, in cases where the IUPAC name differs from the commonly used name, our practice has been to put the IUPAC name in parenthesis adjacent to the common name in the lead sentence, but otherwise not encumber the article with two names.--Smokefoot (talk) 18:58, 10 February 2010 (UTC)[reply]

I think this should be made clearer in the policy. I think it only requires a sentence or two that goes something like "in the event that common usage of a chemical term differs from IUPAC nomenclature then ...." you get the idea. Ok, I think there is overwhelming evidence that despite the IUPAC convention -ide is the common usage term so putting personal preferences aside wikipedia should use the (overwhelmingly) most common term. I will undo my recent actions with regards to the cleanup I was performing from the original page moves!! Jdrewitt (talk) 19:15, 10 February 2010 (UTC)[reply]

While I do see the merit in the COMMONNAME argument, I am a fan of following IUPAC conventions where possible. The reason for the naming is relevant; I believe it was because the former terms ending -ide resembled compound names like chloride, oxide and so were felt to be confusing for learners. I certainly don't think anybody should be doing mass edits until a firm and wide consensus is established here. --John (talk) 20:04, 10 February 2010 (UTC)[reply]

Well I have undone the 146 AWB edits that I made yesterday - I should have got consensus before I made them in the first place but I didn't think they would be controversial bearing in mind how old the original page moves were. I'm putting this one down to experience. It didn't take too long...

If the decision is made that the IUPAC nomenclature should be used then we can get a bot to do all the donkey work instead and then be sure that the whole of wikipedia is IUPAC ok! :) But I think it will be unlikely that consensus will be reached in favour of IUPAC nomenclature bearing in mind the overwhelmingly greater use of -ide in the scientific community. Jdrewitt (talk) 20:14, 10 February 2010 (UTC)[reply]

The naming of articles with two valid names is always a problem. I saw that the strict use of common usage names is as problematic as the strict sticking to IUPAC, which is a organization which has no ruling power over chemistry or even over Wikipedia. Be Bold, but not stupid is the only suggestion I have for the problem. The fights about the use of sulfur/sulphur and aluminium/aluminum are legend in the WPElements, and I am not sure if we always do the right thing. The German wiki has an even better built in stupidity for non German words. They have a book somewhere with a list of how often a word is used and if this number is below X you have to use the foreign writing and if it is above it is by definition a German word and you are allowed to use the German writing. There was the discussion about a small town in the east and the article with the German name was renamed after the usage dropped below the threshold. So a edit war and a long lasting drama which wastes time was the result.--Stone (talk) 21:40, 10 February 2010 (UTC)[reply]

I think sulfur/sulphur and aluminium/aluminum are British vs. American spelling, for which there is a general Wikipedia policy independent of chemistry. --JWB (talk) 21:49, 10 February 2010 (UTC)[reply]

Sorry, but there the project says that IUPAC is above British vs. American spelling policies. This is problematic and always gives long discussions. A article started in british English about Aluminium sulphate and an american one about Aluminum sufite would be perfect with the British vs. American spelling policies, but would make the project as a whole difficult to maintain.--Stone (talk) 21:56, 10 February 2010 (UTC)[reply]

Not saying it should take precedence, just saying there is an additional possibly complicating factor in those cases which is not present in this case. --JWB (talk) 23:48, 10 February 2010 (UTC)[reply]

I would urge the project to be practical and make a choice. Jdrewitt's long-spamming my watchlist twice yesterday was a call for that :-) I think we are seeking some rationale, a justification which doesn't exist, and we should just set a rule and follow it. It is quite same as most other our conventions, which half of the external editors will not understand anyway until we just say "this is a convention chosen on WP". Following IUPAC everywhere is one choice, but they did adopt names for some chemicals which are extremely unpopular everywhere. The argument that -ide sounds like a compound is also valid. On the other side, 10% stats is much too low and can beat any logic. I'm starting a vote below (support/oppose). Please remove or ignore it, but if vote, please be brief. Materialscientist (talk) 23:37, 10 February 2010 (UTC)[reply]

Sorry about the "long-spamming" Materialscientist :S I thought it best to undo my actions and am going to leave any such future changes to someone else (preferably a bot). Jdrewitt (talk) 07:22, 11 February 2010 (UTC)[reply]

Vagina, a recommended medical term, gets 21 million hits whereas pussy, a commonly used slang term, gets 64 million hits. Should we apply WP:COMMONNAME and move vagina to pussy? Of course not! We should abide by the recommendations put forth by the medical governing body! Does anyone see the obvious parallel? --Cryptic C62 · Talk 03:31, 12 February 2010 (UTC)[reply]

Nope, and you can consider removing the above comment for several obvious reasons, including multiple meaning of "pussy" and comparison of vastly different terms and fields. Materialscientist (talk) 03:41, 12 February 2010 (UTC)[reply]

A perfect example of why a Google test should be used with much care. --Dirk Beetstra ^{T C} 07:05, 12 February 2010 (UTC)[reply]

I see no parallel, besides we didn't perform a google search we used google scholar which only searches academic texts. And we get the same results if we consult academic journals directly and search for the same terms. It's fine to use google provided you must also apply common sense! Jdrewitt (talk) 08:52, 12 February 2010 (UTC)[reply]

Just to be sure, Google Scholar gives 253,000 hits for 'vagina' and only 28,200 hits for 'pussy' (where the first 10 hits do not all use the term 'pussy' as a synonym of 'vagina'). I hope this helps. --Dirk Beetstra ^{T C} 09:22, 12 February 2010 (UTC)[reply]

My argument was not meant to be the ultimate refutation of all that has been said (nor was it meant to offend), it was just meant to demonstrate that the obviously correct term won't always be used more than the vernacular term. For those of you who thought my example was too unrelated, non-Google-scholary, or vulgar to be taken into consideration, have at ye: caesium receives ~46k scholarly hits, cesium receives ~315k scholarly hits. This also puts the "10%" argument in perspective since caesium is only used 15% of the time. --Cryptic C62 · Talk 16:13, 12 February 2010 (UTC)[reply]

I don't see how this changes the perspective. We were looking at which term was in predominant usage and it is clear from consulting both google scholar and individual journals that -ide is the most predominent term. All you have shown is that cesium is the most predominent term used over caesium. Are you suggesting that this isn't actually the case? Jdrewitt (talk) 17:30, 12 February 2010 (UTC)[reply]

Allow me to clarify. Although "cesium" gets more Google scholar hits, "caesium" is the IUPAC recommended name and "caesium" is our article. The current logic being put forth in this argument is that because "lanthanide" is more commonly used than "lanthanoid", "lanthanide" should be our article even though "lanthanoid" is recommended by IUPAC. These two contradict each other. We shouldn't abide by IUPAC for caesium and COMMONNAME for lanthanide; we should be consistent. --Cryptic C62 · Talk 21:27, 12 February 2010 (UTC)[reply]

I would love to have a similar but separate discussion and vote on cæsium after this. I also feel "caesium" is incongruous with most existing literature, although it looks like the citation ratio is not quite as overwhelming. But if the project members, who appear to include a good deal of expertise, feel that IUPAC weighs more than that citation ratio, that's fine with me. --JWB (talk) 23:32, 12 February 2010 (UTC)[reply]

The preference in WP for cæsium (or caesium) vs cesium surprised me too initially, but at least they two spellings are pronounced identically. One of many related issues is the aluminium thing, which is about English-English vs American-English, not IUPAC vs common usage.--Smokefoot (talk) 00:48, 13 February 2010 (UTC)[reply]

Thank you for clarifying Cryptic C62. I see your point. However, earlier in this discussion it was mentioned there were numerous cases where wikipedia does not follow IUPAC convention. Can someone provide examples of these? And I think Smokefoot is correct, in the case of Caesium it is more about spelling convention than a name change. Jdrewitt (talk) 08:27, 13 February 2010 (UTC)[reply]

You can check yourself for the adherence to IUPAC. Historically, naming angst originate from suggestions from drive-by editors that contribute little serious content and are therefore perceived as being well-intentioned but professionally naive.--Smokefoot (talk) 14:04, 13 February 2010 (UTC)[reply]

Sorry I wasn't asking anyone to do any unecessary hard work, I just thought since some of you have been involved with these sort of IUPAC issues for some time you may have some really obvious examples. I've looked through the archives, there are of course numerous discussions about the use of IUPAC nomenclature, a selection of what I perceive to be some of the more significant/relevant discussions are here: [1], [2], [3], [4]. Jdrewitt (talk) 15:49, 13 February 2010 (UTC)[reply]

A vote. A lanthanide(actinide) should be chosen over lanthanoid(actinoid)

ide --JWB (talk) 23:50, 10 February 2010 (UTC)[reply]
Support ide -- It doesn't matter how official the term, 10% is far too low, WP:common usage should prevail. Jdrewitt (talk) 07:24, 11 February 2010 (UTC)[reply]
ide, seems for now the one that is commonly used. --Dirk Beetstra ^{T C} 08:33, 11 February 2010 (UTC)[reply]
ide, only because of current stats. Materialscientist (talk) 09:41, 11 February 2010 (UTC)[reply]
ide. Should ide prevail, we might edit our MOS to explain this and similar policy implications.--Smokefoot (talk) 14:35, 11 February 2010 (UTC)[reply]
To me it makes most sense to stick with -ide because of its common use. -- Ed (Edgar181) 14:59, 11 February 2010 (UTC)[reply]
ide in general, but allow occasional/appropriate use of "oid" if the need arises. Check consensus with WP:ELEMENTS. Walkerma (talk) 17:18, 11 February 2010 (UTC)[reply]
ide-- we don't need to mindlessly follow IUPAC recommendations, especially alternatives are in much more common parlance. Yilloslime ^T_C 17:08, 12 February 2010 (UTC)[reply]
ide --Itub (talk) 03:08, 16 February 2010 (UTC)[reply]
ide -- I think it will take many years, if ever, that "oid" becomes the well known name Ronhjones ^(Talk) 21:17, 17 March 2010 (UTC)[reply]

Why in God is there a vote?

IUPAC recommends -oid so it should be -oid. No discussion should be needed. Raistuumum (talk) 03:42, 23 February 2010 (UTC)[reply]

Neither god nor iupac set the style here. It's determined by wiki user consensus. Please respect that. Vsmith (talk) 04:10, 23 February 2010 (UTC)[reply]

Moving actinoid

Apparently, only Lanthanoid was moved. Could an admin move Actinoid? Headbomb {talk / contribs / physics / books} 19:00, 17 March 2010 (UTC)[reply]

Best wait for consensus - there are plenty of admins looking at this talk. Also it might be advisable once we have a good consensus to move protect the pages Ronhjones ^(Talk) 21:18, 17 March 2010 (UTC)[reply]

Consensus is pretty evident above. Headbomb {talk / contribs / physics / books} 21:59, 17 March 2010 (UTC)[reply]

Phosphine vs phosphane

I am not sure why PH3 should be -ine when all the PR3 are already called -ines. Why is that? Nergaal (talk) 04:03, 12 February 2010 (UTC)[reply]

This is similar to the discussion above about lanthanides/lanthanoids. Both phosphine and phosphane are IUPAC names, where 'phosphane' is the IUPAC recommended name. However, most people use 'phosphine' to describe PH_xR_3-x species. It is a matter of WP:COMMONNAME. I hope this explains. --Dirk Beetstra ^{T C} 07:07, 12 February 2010 (UTC)[reply]

The discussion highlights a more difficult problem, i.e. that diphosphine refers to an obscure gas (P2H4_ and to a wildly popular class of ligands. I would guess that 99+% viewers of diphosphine really want to read about the organophosphorus ligands, not the gas. A similar problem with phosphine exists, see Phosphines#Phosphine ligands. We need to solve this glitch.--Smokefoot (talk) 00:48, 13 February 2010 (UTC)[reply]

It would have been nicer, IMHO, if IUPAC had never put their boot into this one in the first place! Why should we say not say "phosphine", by analogy to "amine"? A quick search for "niccolate" on Google indicates that scholarly journals are not too bothered about this sort of obvious nomenclature change (it has been "nickelate" since 1976). A search on Google Scholar will find at least one member of the IUPAC Commission on Inorganic Nomenclature (as it was then) publishing papers entitled in contrary the Commission's recommendations. If the very people who write these rules cannot be bothered to enforce them in their own research groups, I feel that they have little or no value. As for "phosphane", it appears that the chemical community has spoken, at least for the time being. Physchim62 (talk) 15:58, 13 February 2010 (UTC)[reply]

Physchim62 .. bad boy .. of course you are referring to 'azane' in analogy to 'phosphane' .. --Dirk Beetstra ^{T C} 13:44, 22 February 2010 (UTC)[reply]

Beetstra, go on, just try ordering 100 ml of triethylazane and see what the stores manager says to you! I'll warn you, you might need to order a few hundred mils of a ≈5% v/v solution of ethyloxidane in oxidane to recover from his or her reaction! Physchim62 (talk) 14:10, 22 February 2010 (UTC)[reply]

one that's been bugging me is iron(III) chloride

anyone thoughts on this? —Preceding unsigned comment added by 170.170.59.133 (talk) 18:48, 10 March 2010 (UTC)[reply]

ENGVAR / solubility units.

I am opening a discussion here, since I think this needs a bit of discussion. 12.31.4.5 (talk · contribs) is changing two things on a couple of pages about chemicals, and with both I disagree:

In the {{Chembox}} they changes 'colourless' to 'colorless'. In my opinion this goes against WP:ENGVAR, though they argues that all references and external links use the American English spelling.
Also in the {{Chembox}}, they changes '0.015 g / 100 mL (20 °C)' to '0.015 g/100 g (20 °C)' (later to '0.015 g/100 g Water (20 °C)'). If I am correct, 0.015 g / 100 mL means that there is 15 mg of (in this case, ethylbenzene) dissolved in 100 mL total volume of solution, with the solvent being water. I presume here, that the reference that the value is taken from says it as '0.015 g / 100 mL (20 °C)', and hence that is what we report, but there is not a direct reference for this point of data). Though the density of this solution (of ethylbenzene) will be close to 1, that is not the same as 0.015 g / 100 g. They argues that it is 0.015 g ethylbenzene dissolved in 100 mL water, and hence, that 0.015 g / 100 mL is the same as 0.015 g / 100 g (ignoring the small deviation of the density of water, which is not '1.000' at 20 °C, but I can live with that small deviation).

The second point does brings a next question. IMHO, it would be good to have all values in the same unit. Solubility_table (as 12.31.4.5 argues) is in g / 100 g, and it would be nice to have all in the same unit (we might even consider to use an alternative parameter (e.g. Solubility_standard, like can be done with 'BoilingPt' -> 'BoilingPtC'), which would standardize our information a bit further (I did have a glance at WP:UF, though there is not a standard chemitry microformat ..).

Basically, we disagree on these points, but I think it is useful to discuss this in a wider community. Thanks. --Dirk Beetstra ^{T C} 08:32, 18 February 2010 (UTC)[reply]

I've also crossed with some anon who claimed that g/100g is a standard on WP; I just reverted them because it is not - most WP articles are in g/100 mL. The solubility table is for water, and given the accuracy of those values, it is safe to change, IMHO, g/100g to g/100 mL, but. I was wondering why listing values in g/100 mL and not in g/L ? I don't see any problem with ENGVAR - the policy is quite clear on which spelling to keep. Materialscientist (talk) 08:46, 18 February 2010 (UTC)[reply]

For 0.015 g / 100 g to 0.015 g / 100 mL, yes .. but if we are talking brine, I don't think that 26.4 g / 100g is 26.4 g / 100 mL there .. --Dirk Beetstra ^{T C} 08:50, 18 February 2010 (UTC)[reply]

GA reassessment of Vitamin C

I have conducted a reassessment of the above article as part of the GA Sweeps process. You are being notified as this project's banner is on the talk page. I have found some concerns which you can see at Talk:Vitamin C/GA1. I have placed the article on hold whilst these are fixed. Thanks. Jezhotwells (talk) 23:08, 19 February 2010 (UTC)[reply]

Element books

WP:ELEMENTS started creating books on each individual elements. Since there are a lot of them, any help would be very much appreciated. Headbomb {^ταλκ_{κοντριβς} – WP Physics} 02:32, 28 February 2010 (UTC)[reply]

Triisopropylamine

Hi guys

Can you guys do a sanity check of this image:

Before I put it up on the article? Thanks. --Rifleman 82 (talk) 13:40, 1 March 2010 (UTC)[reply]

The addition of a Grignard reagent to a nitrile won't normally provide a methyl group. Either something is wrong in the image, or some very unusual chemistry is going on there. -- Ed (Edgar181) 14:44, 1 March 2010 (UTC)[reply]

Sorry, the paper (Hans Bock, Ilka Goebel, Zdenek Havlas, Siegfried Liedle, Heinz Oberhammer (1991). "Triisopropylamine: A Sterically Overcrowded Molecule with a Flattened NC3 Pyramid and a "p-Type" Nitrogen Electron Pair". Angew. Chem. Int. Ed. 30 (2): 187–190. doi:10.1002/anie.199101871.{{cite journal}}: CS1 maint: multiple names: authors list (link)) said CH3HgCl, not the Grignard. I suppose it was relatively unusual that I typed Mg in place of Hg. That aside, does it make sense? --Rifleman 82 (talk) 14:49, 1 March 2010 (UTC)[reply]

Actually, now that I think about it a moment, the reaction will proceed through elimination of HCN, followed by addition of the methylmercury to the resulting imine. So, yes, this makes sense to me now. -- Ed (Edgar181) 14:59, 1 March 2010 (UTC)[reply]

Ah, that's great. Thanks. I'm not familiar with mercury used this way. --Rifleman 82 (talk) 15:03, 1 March 2010 (UTC)[reply]

pentacarbon dioxide

Hi,

Please, Excuse my english. In this article, it is question of 1,3,5-triaza-cyclohexane-2,4,6-trione (C6N3O3) which seems very strange. I already asked the French chemistry project here and for now, we think it should be 1,3,5-triazinane-2,4,6-trione C3H3N3O3, the tautomer of cyanuric acid which is still very different. The page 97 of the book referenced on the article isn't visible on googlebooks. We found about 1,3,5-triaza-cyclohexane-2,4,6-trione, the reference : Comments on inorganic chemistry, Volume 16, Number 6, 1994, page 104. One of you who have access to this journal in a good science library, could check what is the compound with this name and what is really his formula, please ? --tpa2067 ^(Allô...) 15:51, 4 March 2010 (UTC) —Preceding unsigned comment added by Tpa2067 (talk • contribs)

If you type either of these names into ChemDraw, you get the same molecule, tautomer number 2 below (from cyanuric acid).

Ben (talk) 16:49, 4 March 2010 (UTC)[reply]

Ferrous sulfide = sulfanylideneiron?

PubChem lists the IUPAC name of ferrous sulfide as sulfanylideneiron. Is that correct? Almost nobody seems to use that term. But if it is correct we should definitely add it to our article. AxelBoldt (talk) 23:36, 12 March 2010 (UTC)[reply]

No, it's PubChem being idiotic (again...) Sulfanylideneiron would be the Fe=S molecule, which is rather different chemical (and probably non-existent) from common-and-garden iron(II) sulfide. Physchim62 (talk) 09:05, 13 March 2010 (UTC)[reply]

What about the vapour phase? I'm aware that in the solid phase, it is an ionic solid, but what is it's vapour phase does it convert to an covalent molecule--Plasmic Physics (talk) 07:16, 6 June 2010 (UTC)[reply]

Copper monosulfide

There is some minor naming conflict around that article. Copper monosulfide argument is based on that copper is not simply in 2+ state there, as reflected in the article and its talk; however, this name is not popular on Google books, and copper (II) sulfide is more conventional there. An argument against monosulfide, expressed at my talk, is that prefixes, such as "mono-", should not be used to name ionic compounds. Thoughts? Materialscientist (talk) 04:22, 14 March 2010 (UTC)[reply]

At times like this, we really miss editor User:Axiosaurus who was our chalcogen expert. If one look at the structure of covelite, it is mixed valence at the sulfur part as it contains both isolated S and S₂ centers, which most reasonable people (i.e. those who agree with me) would assign as S^2- and S₂^2-. Hence the Cu's have two oxidation states. Copper sulfides are described as highly covalent in contrast to what the ~~idiot,~~ other editor asserts.--Smokefoot (talk) 05:12, 14 March 2010 (UTC)[reply]

Maybe copper(I,II) sulfide in parallel with iron(II,III) oxide? Is the IUPAC name simply copper sulfide as the chembox states. Vsmith (talk) 14:00, 14 March 2010 (UTC)[reply]

Yes, in principle copper sulfide refers unambiguously to the compound with formula CuS in stoichiometric nomenclature: obviously, in practice, it is better to provide a bit more information as "copper sulfide" can also refer to the group of Cu_xS_y compounds, of which there are many. Iron(II,III) oxide should really be iron(II) diiron(III) oxide, or iron(2+) diiron(3+) tetra[oxide(2−)] (spinel type) if you want to be really pedantic. Physchim62 (talk) 23:47, 14 March 2010 (UTC)[reply]

Copper(I,II) sulfide isn't an ideal name because (according to the article), all the coppers are Cu(I) and the sulfurs are not all sulfides (i.e. S²⁻).

Copper(I,II) sulfide implies (Cu⁺)₂(Cu²⁺)(S²⁻)₂, i.e. Cu₃S₂.

Ben (talk) 15:57, 14 March 2010 (UTC)[reply]

Just going on the structure, it looks like (Cu⁺)₂(Cu²⁺)(S²⁻
₂)(S²⁻), or copper(I,II) disulfide sulfide, but I'll bet there's a lot less actual charge separation than that. After all, since when did one see a trigonal planar Cu²⁺ ion? And shouldn't the sulfide ion be sufficiently reducing to reduce copper(II) to copper(I) in any case? I have no problems in using the stoichiometric name (copper monosulfide) to title the article: if we needed an alternative, we could use copper sulfide (covellite), although I don't think we have any other articles which are disambiguated in that manner. Physchim62 (talk) 17:13, 14 March 2010 (UTC)[reply]

That covellite disamb. works for me (mineralogy background), but not likely supportable from usage by WP:RS. So, how is the compound named in those RS's? I find the IUPAC Name: sulfanylidenecopper [5] a bit much and seldom used (only 46 google hits). Vsmith (talk) 23:10, 14 March 2010 (UTC)[reply]

Sulfanylidenecopper would be wrong, unless we happened to be talking about the Cu=S molecule in the gas phase! We do actually have some support from IUPAC for using the mineral name as a disambiguation: see International Union of Pure and Applied Chemistry (2005). Nomenclature of Inorganic Chemistry (IUPAC Recommendations 2005). Cambridge (UK): RSC–IUPAC. ISBN 0-85404-438-8. p. 237. Electronic version., which allows the use of mineral names to define structural types. CAS uses the stoichiometric formula for disambiguation [6], although we would run into problems with displaying titles if we adopted that approach. Physchim62 (talk) 23:47, 14 March 2010 (UTC)[reply]

Web of science hits:

"Copper monosulfide" 3
"Copper(II) sulfide" 23
"Copper sulfide" 871

Looking through the last set, it refers almost equally to either CuS or Cu2S, suggesting that there is no specific name for CuS. Perhaps this is another area where the project can decide the WP convention. Materialscientist (talk) 23:36, 14 March 2010 (UTC)[reply]

Well, I vote for copper monosulfide. Copper sulfide currently is a fleshed-out disambiguation article that discusses the range of compositions for CuS_x, including cuprous phases (thanks to Axiosaurus). Alternatively we could rename copper sulfide diambig article as copper sulfides, and then assign copper sulfide to what we currently call copper monosulfide.--Smokefoot (talk) 00:27, 15 March 2010 (UTC)[reply]

Technically, moving articles is not a problem - we can have Copper sulfide and Copper sulfide (disambiguation), as conventional for other topics on WP. Materialscientist (talk) 00:32, 15 March 2010 (UTC)[reply]

On the other hand, we tend not to use names which are ambiguous between two chemical compounds except as the title for an article about a class of compounds (such as copper sulfide is at the moment). Copper monosulfide is unambiguous. The argument that you shouldn't use "mono-" for ionic compounds is completely back-to-front; you shouldn't use Stock notation (with the oxidation number in brackets) unless the compound is substantially ionic (so no manganese(VII) oxide). So "copper(II) sulfide" is wrong on two counts: it's the wrong oxidation state and it implies ionic bonding when the compound is substantially covalent. The downside with "copper monosulfide" as the article title is that we are just about the only people using that name. Physchim62 (talk) 02:13, 15 March 2010 (UTC)[reply]

Oxiranes as Subcategory in epoxide

Just noticed that a separate cathegory exists for Category:Oxiranes which is a subcategory in Category:Epoxides. Any naming nuance I must have missed? If not, I put all oxirane-articles in the epoxide category... L.tak 19:19, 5 April 2010 (UTC)

The two are synonymous. I agree that it would be best to move articles from Category:Oxiranes to Category:Epoxides. -- Ed (Edgar181) 20:42, 5 April 2010 (UTC)[reply]

done, made a soft direct on Category:Oxiranes... L.tak 21:44, 5 April 2010 (UTC) —Preceding unsigned comment added by L.tak (talk • contribs)

Missing chemistry topics

I've updated my list of missing chemistry topics - Skysmith (talk) 13:24, 8 April 2010 (UTC)[reply]

2-Aminopurine structure

I discovered a small mistake in the 2-aminopurine structure, the hydrogen on the N7 should be on the N9 and the double bond should be between the C8 and the N7 instead of between the C8 and N9. I am not sure if this is the right place to report this kind of errors but I just registered to wiki and I have no clue how to change this structure myself

Kountraya 18:17, 9 April 2010 (UTC) —Preceding unsigned comment added by Kountraya (talk • contribs)

It's a matter of convention rather than chemistry where you place the nitrogen, so it's not a serious (i.e., chemically wrong) error. I'm trying to find the recommendations for purine structures to see if we're following them: I'll report back! Physchim62 (talk) 18:28, 9 April 2010 (UTC)[reply]

The "standard" tautomer of purine is 7H, see Panico, R.; Powell, W. H.; Richer, J. C., eds. (1993). A Guide to IUPAC Nomenclature of Organic Compounds. IUPAC/Blackwell Science. p. 168. ISBN 0-632-03488-2. Physchim62 (talk) 18:42, 9 April 2010 (UTC)[reply]

Thank you for your quick answer, I guess I have been mislead by the fact that the aminopurine used as a nuctleotide analogue is always bound to the sugar by its N9. Kountraya 19:30, 9 April 2010 (UTC) —Preceding unsigned comment added by Kountraya (talk • contribs)

classification of nitrogen heterocycles

I think category:nitrogen heterocycles needs to be kind of reformed. It's kind of disorganised. Right now I'm in the process of further breaking it down along the lines of aromatic, aliphatic (it's possible to have a compound which has both), simple or polycyclic, etc. with further information on whether there's a nitrogen that's imine-like, enamine-like, basic sp2, basic sp3, etc. I think this would be a little more informative. John Riemann Soong (talk) 19:22, 21 April 2010 (UTC)[reply]

You might consider upgrading heterocyclic chemistry before the category business. IMHO, your implied talents would have greater impact focusing on this important and needful article. At present, it is a pretty good list, but lacks an overviews on construction approaches, patterns of reactivity, and occurrence. --Smokefoot (talk) 23:39, 21 April 2010 (UTC)[reply]

I would recommend comparing with the categorization of heterocyclic compounds on Commons, which seems to be better organized. -- Ed (Edgar181) 17:18, 28 April 2010 (UTC)[reply]

Structure request

I was wondering if someone might be able to draw a structure for me. The chemical is haematopodin, a pigment found in the mushroom Mycena haematopus (currently at FAC). The structure may be found here, p. 603. Thanks in advance, Sasata (talk) 17:02, 28 April 2010 (UTC)[reply]

Haematopodin
Haematopodin B

Rifleman 82 (talk) 17:15, 28 April 2010 (UTC)[reply]

Wow! That was fast... thanks so much! Sasata (talk) 17:20, 28 April 2010 (UTC)[reply]

Can the pyrrole-nitrogen H be moved closer to the N? Looks like it's floating off a bit. But actually, this is just the easily-dectected compound...the "actual" primary pigment is haematopodin B, which has an NH imine instead of carbonyl at C7 (per quinoline ring-numbering)--see doi:10.1002/ejoc.200700739. It's all an interesting bit of chemical detective-work on those two. Rifleman, could you draw the other also, so we can have comparable structures of both for comparison there? We don't seem to have articles about anything directly related. DMacks (talk) 17:52, 28 April 2010 (UTC)[reply]

About the floating hydrogen - I've looked through the settings and I can't figure out what to tweak. If you are using chemsketch perhaps you can show me? --Rifleman 82 (talk) 01:14, 29 April 2010 (UTC)[reply]

I may have ChemSketch at work...will try tomorrow. I usually use ChemDraw, which puts the H in a less odd position. But when I use (what I think are) the WP:CHEM recommended settings, the atom labels look out-of-proportion small compared to the bonds and overall structure. See for example File:Ethylenetetracarboxylic_acid_dehydrations.png and File:Ullmann p-diphenoxybenzene.png. Would be great if WP could host actual template files rather than listing a pile of values to enter in a ton of preference panes in each editor program. DMacks (talk) 01:30, 29 April 2010 (UTC)[reply]

I found it simpler to rely on ACS settings. Just have to export them at high res? --Rifleman 82 (talk) 01:45, 29 April 2010 (UTC)[reply]

I just wanted to remind that we have the page Wikipedia:WikiProject Chemistry/Image Request. Unfortunately, there is however not much traffic… --Leyo 08:06, 29 April 2010 (UTC)[reply]

I used the images and some of the info from Mycena haematopus to start Haematopodin and Haematopodin B. The articles are now stubs, and are in need of some more info on them. --Dirk Beetstra ^{T C} 12:20, 29 April 2010 (UTC)[reply]

List of commonly available chemicals

I think that brief ways to produce these chemicals should be listed along with the properties in the list of commonly available chemicals. --Chemicalinterest (talk) 18:50, 5 May 2010 (UTC)[reply]

While well intentioned, the creation of list of commonly available chemicals is ill-advised. The topic is basically original research (who is to decide what is "common"?). What next, uncommon chemicals? --Smokefoot (talk) 22:28, 5 May 2010 (UTC)[reply]

Have you seen common chemicals? --Rifleman 82 (talk) 02:19, 6 May 2010 (UTC)[reply]

A common chemical is one that you do not have to buy from a chemical supply store or can be manufactured at home, such as chlorine(electrolysis of brine with carbon electrodes[platinum is not needed, carbon is available in Leclanche cells]), sodium sulfate(reaction of lye with battery acid), or calcium oxide (extreme heating of clamshell). --Chemicalinterest (talk) 10:37, 6 May 2010 (UTC)[reply]

Hmm, still close to original research, a lot, if not everything, can be made at home, it may be a lot of work to construct a steroid, but starting from acetic acid, calcium carbide, sodium chloride, water, and maybe even sugar, one can get everywhere. --Dirk Beetstra ^{T C} 10:54, 6 May 2010 (UTC)[reply]

Both common chemicals and list of commonly available chemicals are silly and appear to violate the guidelines. "Wikipedia is not a place to publish your own thoughts and analyses or to publish new information." The work is also a form of guidebook, also discouraged: "Wikipedia is not a directory of everything that exists or has existed" WP:NOTDIRECTORY, WP:NOTCATALOG, WP:NOTYELLOW. "The Wikipedia is not a manual, guidebook, textbook, or scientific journal" seeWP:NOTGUIDE etc. Oh well, I might think the effort is ill-advised, but it's just disk space and makes people feel productive.--Smokefoot (talk) 12:23, 6 May 2010 (UTC)[reply]

If the article was so bad, why wasn't the nomination for deletion favored? --Chemicalinterest (talk) 11:43, 18 May 2010 (UTC)[reply]

Requested move

At Talk:Aluminium borohydride there is a request to move aluminium borohydride to aluminum borohydride, if anyone wishes to comment. ChemNerd (talk) 17:20, 7 May 2010 (UTC)[reply]

Discussion closed.--Chemicalinterest (talk) 21:52, 19 May 2010 (UTC)[reply]

New articles

Chloro(dimethyl sulfide)gold(I) --Rifleman 82 (talk) 14:57, 9 May 2010 (UTC)[reply]

b-PDB @ Liquid Scintillator Neutrino Detector

I'm no chemist, but the long name version of that chemical doesn't seem to follow correct hyphenation conventions. Can anyone take a look? Headbomb {talk / contribs / physics / books} 13:32, 11 May 2010 (UTC)[reply]

most likely 2-(4-Biphenyl)-5-(4-t-butylphenyl)-1,3,4-oxadiazole or 2-biphenyl-4-yl-5-(4-t-butylphenyl)-1,3,4-oxydiazole buy it at Sial --Stone (talk) 14:58, 11 May 2010 (UTC)[reply]

Thanks. Headbomb {talk / contribs / physics / books} 15:05, 11 May 2010 (UTC)[reply]

No problem! --Stone (talk) 15:15, 11 May 2010 (UTC)[reply]

You even have an article on it now! Physchim62 (talk) 10:36, 22 May 2010 (UTC)[reply]

edit

{{editprotect}} Please remove the protection and Chemicals/Style guidelines Gnevin (talk) 08:18, 21 May 2010 (UTC)[reply]

As far as I can see, it is not protected .. --Dirk Beetstra ^{T C} 08:20, 21 May 2010 (UTC)[reply]

Sorry was redirected here . Wikipedia:WikiProject_Chemicals/Style_guidelines is the page Gnevin (talk) 08:24, 21 May 2010 (UTC)[reply]

Unprotected — Martin (MSGJ · talk) 09:59, 21 May 2010 (UTC)[reply]

Note that that page is historical, and no longer in use. The style guidelines are now Wikipedia:Manual_of_Style_(chemistry). Hence, I'm not sure if Wikipedia:WikiProject_Chemicals/Style_guidelines should be unprotected... --Dirk Beetstra ^{T C} 10:02, 21 May 2010 (UTC)[reply]

I'm happy for you to revert that action, but I don't believe there is any precedent for fully protecting pages just because they are marked as {{historical}}. — Martin (MSGJ · talk) 10:05, 21 May 2010 (UTC)[reply]

Nickel(III) oxide use in secondary cells

If [[nickel(III) oxide is used so commonly in secondary cells such as ni-cad and nickel metal hydride battery, why is it not well characterized? It doesn't show how it is made industrially either. --Chemicalinterest (talk) 12:49, 28 May 2010 (UTC)[reply]

You don't have to know the composition and structure of a substance to use it. Methylalumoxane is another example of a very widely used substance (for making polythene and related products) whose structure is a bit elusive.

Ben (talk) 13:35, 28 May 2010 (UTC)[reply]

Do they make it using the way shown in the article? It seemed more like a laboratory process, not an an industrial process. --Chemicalinterest (talk) 14:36, 28 May 2010 (UTC)[reply]

No, I doubt they make it that way! For the electrodes in a secondary cell, the simplest way would be to stick a piece of nickel in a suitable acid solution and then charge it up as the anode of a electrolytic cell at a suitably high potential. That's roughly how you make lead dioxide in a lead–acid battery. Physchim62 (talk) 14:49, 28 May 2010 (UTC)[reply]

By the way, is that "No Image" really necessary on Methylalumoxane? --shoy (reactions) 17:11, 28 May 2010 (UTC)[reply]

IUPAC name for urea

Resolved

– Thanks folks. Adrian J. Hunter^{(talk•contribs)} 11:29, 4 June 2010 (UTC)[reply]

Speaking of IUPAC, there's a discussion at Talk:Urea#IUPAC_name that could use knowledgable input. Adrian J. Hunter^{(talk•contribs)} 03:51, 4 June 2010 (UTC)[reply]

Expansion of Category:Inorganic compound stubs

Please take a look at what I did there and give guidelines for whether it is good to expand articles like that. Thank you. --Chemicalinterest (talk) 12:56, 4 June 2010 (UTC)[reply]

How do you verify your chembox data ?

Hi, I just wondering how do you verify your data in the chembox ? No links between data and books or database are provided. Biglama (talk) 13:11, 21 June 2010 (UTC)[reply]

Tetraethyllead (known around the world as "tetraethyl lead"

Appears to be some disagreement about the current article name. The interested are invited to comment at Talk:Tetraethyllead. --Rifleman 82 (talk) 14:43, 26 June 2010 (UTC)[reply]

Note to Plasmic Physics. Re: Your support for a "ramrod" change by Rifleman 82 with no discussion, to the TEL page. You wrote: "Besides, the name change is nearly the same as your proposed name change, albeit with a space removed between lead and tetraethyl. Tetraethyllead is an additively constructed IUPAC name ..." Ever hear of thalidomide? Well, hell, it was "nearly the same", just an enantiomer! (was it the R or S vs.?, I can't remember). "Tetraethyllead" is not the name of the compound developed by Mr. Midgely, nor was it the name DELCO labs, Mr. Kettering, the Ethyl Corp, the DuPont Corp, or General Motors used". Jack B108 (talk) 22:11, 27 June 2010 (UTC)[reply]

While (R)-thalidomide refers to a similiar subtance, (S)-thalidomide, tetraethyllead and tetraethyl lead refers to the exact same substance. You are not comparing appels with appels. What Mr. Midgely named it isn't important in determining the name of the article.--Plasmic Physics (talk) 23:48, 27 June 2010 (UTC)[reply]

See Schlosser's base. Google hits: "LICKOR": 11,500; "Schlosser's base": 146,000. Guess what Manfred Schlosser named it? --Rifleman 82 (talk) 05:11, 28 June 2010 (UTC)[reply]

JackB108's rhetoric suggests that he is over-reacting. We are all in agreement that articles should be highly accessible, and redirects do this smoothly.--Smokefoot (talk) 06:39, 28 June 2010 (UTC)[reply]

Ethylene oxide - proposal to pre-announce big edits

Super-large revision of ethylene oxide, a key chemical compound in terms of its use and production levels. The addition was made by a highly experienced editor. Nonetheless, I suggest that plans such massive (68kb) changes be announced on the relevant talk page with a plan of action. --Smokefoot (talk) 06:39, 28 June 2010 (UTC)[reply]

Information is mostly from the ru.wiki FA article (similar past cases: alkaloid, substituted amphetamine, lactoferrin, diallyl disulfide). Please do check the article. I can't preannounce such things - everything was composed within a day off-line. Materialscientist (talk) 06:52, 28 June 2010 (UTC)[reply]

Well I disagree, respectfully: Not only can you and any of us all pre-announce ideas of super-large edits, such notices would be useful procedurally (minimize wasted editing) while demonstrating good collegiality.--Smokefoot (talk) 15:15, 28 June 2010 (UTC)[reply]

Ah, you were expanding it off-line too? Sorry. I will, but it was really a quick decision to expand it. Materialscientist (talk) 22:52, 28 June 2010 (UTC)[reply]

Change of ilo.org site structure

There seems to have been a change in the structure of the ilo.org site. It breaks links with prefix http://www.ilo.org/public/english/protection/safework/cis/products/icsc/dtasht/ (and almost surely also shorter prefixes). The new links have /legacy/ instead of /public/. This change invalidates many links (seems like over 200: [7]) pointing to ICSC data sheets of chemicals. I think it would be impractical to change it manually, so maybe some bot could be set up to do the work. --Tomaxer (talk) 23:58, 29 June 2010 (UTC)[reply]

PS Or creating a new template may be a good option... --Tomaxer (talk) 00:01, 30 June 2010 (UTC)[reply]

A lot of them are inserted using templates, so we can do those relatively quickly. It's probably best to make them point to http://www.inchem.org/documents/icsc/icsc/ which has the ICSCs and lots of other useful stuff as well. Physchim62 (talk) 00:04, 30 June 2010 (UTC)[reply]

Hmm, the two templates {{ICSC}} and {{ICSC-ref}} were updated last September, so the ones that are left are the ones which are untemplated... Physchim62 (talk) 00:08, 30 June 2010 (UTC)[reply]

Really, I've forgotten that there already exist these templates. OK, so I'll start to gradually replace those incorrect links by ICSC templates. Thank you. --Tomaxer (talk) 14:24, 30 June 2010 (UTC)[reply]

There seems to be a problem with replacing these templates. I've found out that large part of the articles including these links includes it in the Chembox parameter MSDS with "ICSC nnnn" as the description text. However, none of the two templates can generate such short desc. text and using them would, in my opinion, significantly and unnecessarily expand that field. Also putting it in ref would make it look strange. One solution may be to create one more new template after all with desc. text "ICSC nnnn". Other possibility would be to simply move links in the affected articles from Chembox to the External links section (or entirely remove them, but I don't think this is a good idea). --Tomaxer (talk)

Methane clathrate

As important as this subject is recently with the Deepwater Horizon oil spill, it could use some attention from someone smarter than I. --shoy (reactions) 17:34, 30 June 2010 (UTC)[reply]

Special:Contributions/Sckm

Should this user's contributions be seen as unwanted advertisement for “Bioshields”? --Leyo 11:34, 1 July 2010 (UTC)[reply]

Some, but not all. I have left that user's edits at chlorhexidine because they seem to be within our usual practice, but other cases are worse. Nobody has yet contacted the user on the user talk page, that should really be the first step. Physchim62 (talk) 14:39, 1 July 2010 (UTC)[reply]

Stone has already reverted some edits. Is there a talk page template to inform users about “spaming”? --Leyo 21:03, 1 July 2010 (UTC)[reply]

Dunno, Beetstra (talk · contribs) is the person around here who is most involved with conflict-of-interest questions. The account's contributions seem strange to me, but there's very little I can do directly. Physchim62 (talk) 23:02, 1 July 2010 (UTC)[reply]

Commons:Template:Molecule

Uploaders of chemical structures on Commons are asked to state their opinion here. --Leyo 23:44, 7 July 2010 (UTC)[reply]

BTW: This template is quite similar to Commons:Template:Chemical structure verified. --Leyo 13:20, 12 July 2010 (UTC)[reply]

Polyimides

User talk:Materialscientist#You came to mind (2nd instance)
User talk:Wizard191#Polyimides

As above. Uncle G (talk) 04:13, 11 July 2010 (UTC)[reply]

I support the move of Vespel to a proper chemical name, leaving Vespel and Meldin as redirects. I'm not sure about that name though. Poly-(4,4'-biphenyl-(pyromellitic acid)-diimide), proposed at Talk:Vespel is somewhat unwieldy. There should be a better alternative (keywords could be poly, oxydiphenylene, pyromellitimide). Materialscientist (talk) 04:40, 11 July 2010 (UTC)[reply]

CheMoBot

CheMoBot is inserting a {{cascite}} in the chembox when the CAS number doesn't exist in the alledged source, for acridine orange.

I am going to presume here that someone did check the source in one of the other sources of CAS (the paper version), though indeed it does not exist on commonchemistry.org (CheMoBot is working from our validation indexes, not from the page on commonchemistry.org). That limitation of commonchemistry.org is still a problem, maybe we should find a way to 'separate' that). --Dirk Beetstra ^{T C} 07:42, 18 July 2010 (UTC)[reply]

A vote on mass addition of video links

is here. Please participate. Materialscientist (talk) 05:52, 18 July 2010 (UTC)[reply]

bongkrek acid

The diagram at right shows the structure of bongkrek acid. The article gives the IUPAC name as (2E,4Z,6R,8Z,10E,14E,17S,18E,20Z)-20-(carboxymethyl)-6-methoxy-2,5,17-trimethyldocosa-2,4,8,10,14,18,20-heptadioic acid. I'm pretty sure the last part of this is wrong - docosaheptadioic makes no sense to me with a hepta in the centre, and I am thinking it should be docosaheptaenedioic acid (or possibly docosaheptenedioic acid), but I would appreciate a double check from an organic chemist. Thanks, EdChem (talk) 11:25, 30 July 2010 (UTC)[reply]

I'm no organic chemist, but that should certainly be -heptaenedioic. I'll check ChemSpider. Fvasconcellos (t·c) 13:43, 30 July 2010 (UTC)[reply]

Thanks... I've been doing some more checking and have run into some more issues with this article. Firstly, the given molecular formula was wrong (given as C₂₈H₃₅O₇ when it should have been C₂₈H₃₈O₇). Second, the JBC reference refers to bongkrekic acid and not bongkrek acid, giving a (? I think C₂₈H₃₈O₇) structure for bongkrekic acid which is clearly different from that shown above (first page of the article clearly shows a bongkrekic acid structure that includes a cyclopentene ring, which the article sources to a PhD thesis). This suggests to me that bongkrek acid and bongkrekic acid are structural isomers. However, the bongkrek acid page lists bongkrekic acid as an alternative name and bongkrekic acid redirects to bongkrek acid, strongly implying they are the same substance. There are sources that refer to the two names as alternatives / synonyms and molecule of the day offers the structure above for bongkrek acid. Help! Is the JBC article just wrong? If it's not, does it support anything in an article on bongkrek acid? Am I just confusing myself? Thanks, EdChem (talk) 15:20, 30 July 2010 (UTC)[reply]

It appears the chemical structure of bongkrekic acid was revised in 1973 (De Bruijn, J.; Frost, D. J.; Nugteren, D. H.; Gaudemer, A.; Lijmbach, G. W. M.; Cox, H. C.; Berends, W. Structure of bongkrekic acid. Tetrahedron (1973), 29(11), 1541-7) The JBC article is from 1970, so it would be expected to have the incorrect structure. The most recent article on the topic that I can find is this one: PMID 10435074. It unambiguously refers to bongkrekic acid and bongkrek acid as synonyms. -- Ed (Edgar181) 15:36, 30 July 2010 (UTC)[reply]

Great, thanks - that makes it all just a matter of improved referencing :) EdChem (talk) 15:38, 30 July 2010 (UTC)[reply]

Rhodocene

Over the last couple of days, I have been writing a new page on the metallocene rhodocene. It's my first attempt at writing a page from scratch, and also my first attempts at uploading any images. I'd appreciate thoughts / comments / suggestions / criticisms, etc. Of course, anyone wanting to jump in and make some changes is welcomed too. EdChem (talk) 13:20, 2 August 2010 (UTC)[reply]

Could you upload the structural formulae in a higher resolution? --Leyo 15:15, 2 August 2010 (UTC)[reply]

Sorry, but no. I don't have a functional version of ChemDraw any more, so I can only make files using existing images I had for other purposes and my skills with images are fairly limited. I suspected that redrawing might be needed, but I figured that a low-res image was better than no image. EdChem (talk) 15:51, 2 August 2010 (UTC)[reply]

I can redo the drawings. The article is relatively specialized, especially considering the needs within WP-chemistry - so many topics that are crying for a general article and so many articles needing re-editing. But rhodocene is nifty and instructive in its own way. --Smokefoot (talk) 17:24, 2 August 2010 (UTC)[reply]

Nessler's reagent

I propose moving this article to potassium tetraiodomercurate(II), with Nessler's reagent redirecting back to a section similarly named. One's a compound, the other's a preparation, and it's misleading to use the chembox thus. --Rifleman 82 (talk) 01:32, 9 August 2010 (UTC)[reply]

I agree, Nessler's reagent should be a section within the potassium tetraiodomercurate(II) article. Also, some of the data in the current article seems questionable to me, such as the melting point being "120-127 °C, 266 K, -77 °F"... unless these are three different temperatures / ranges spanning nearly 200 °C, which would be a melting point without parallel in my experience. EdChem (talk) 03:54, 9 August 2010 (UTC)[reply]

That's a bug... when you enter 120-127 °C, it is interpreted as 120-127 = −7 °C. And converted accordingly. --Rifleman 82 (talk) 04:26, 9 August 2010 (UTC)[reply]

OK, thanks, I see how that gets to 266 K, but how does the bug produce −77 °F? EdChem (talk) 04:45, 9 August 2010 (UTC)[reply]

Infobox link

There are very common chemicals that wiki offers a data page for it. I.e. diethyl ether has diethyl ether (data page). Where this happens, the infobox itself should offer such a link (automatically). 18.111.55.86 (talk) 06:27, 10 August 2010 (UTC)[reply]

Click on the header "Supplementary Data Page". --Rifleman 82 (talk) 06:45, 10 August 2010 (UTC)[reply]

but that is not obvious at all. there should be some link closer to the top. 18.111.55.86 (talk) 19:24, 10 August 2010 (UTC)[reply]

In general, the data page contains information that is deemed least important, so I think it makes sense to have the link towards the end of the chembox rather than prominently featured at the top. -- Ed (Edgar181) 19:28, 10 August 2010 (UTC)[reply]

Ammonium diuranate

There is a strange error with the chembox that I cannot track down at the moment. --Leyo 12:37, 17 August 2010 (UTC)[reply]

I guess, the image-related lines were missing that caused the template to take some odd default values. Quick-fixed. Materialscientist (talk) 12:57, 17 August 2010 (UTC)[reply]

Thanks. How it looked before can be seen here. --Leyo 13:10, 17 August 2010 (UTC)[reply]

Redirect for discussion

Wikipedia:Redirects for discussion/Log/2010 August 14#Trichloroazane

The question has been raised as to whether trichloroazane is an alternative name for nitrogen trichloride that actually occurs. Please contribute to the discussion. Uncle G (talk) 07:40, 20 August 2010 (UTC)[reply]

Moving Zncl2

Could an administrator delete the Zncl2 redirect page? It is misleading (it has the wrong chemical formula) and the ZnCl2 redirect page is already existing. Thanks! YOSF0113 (talk) 08:44, 24 August 2010 (UTC)[reply]

I think this falls in the category 'common typo's', and redirects are cheap anyway. No need to delete such a redirect (this redirect works for those who type zncl2 as well!). --Dirk Beetstra ^{T C} 09:33, 24 August 2010 (UTC)[reply]

Example of a bad redirect

Given the two previous sections, both of which were resolved as "no action needed", I thought it would be an idea to give an example of a truly bad redirect for comparison. From December 2005 until very recently azine redirected to pyridine. Now azine is a possible name for pyridine in Hantzsch–Widman nomenclature but, more importantly, it is also the name of a class of compounds on which we had no article! These are the sort of redirects that need dealing with, not the harmless ones. Physchim62 (talk) 03:09, 26 August 2010 (UTC)[reply]

19NorDehydroepiandrosterone

The article 19NorDehydroepiandrosterone appears to be entirely fictional. As far as I can tell, the chemical compound is not mentioned at all in any of the listed references. Is this part of some kind of scam, maybe to boost the sales of bodybuilding supplements that purportedly contain this? ChemNerd (talk) 21:10, 26 August 2010 (UTC)[reply]

Hmm.. how about [8]?--Rifleman 82 (talk) 21:33, 26 August 2010 (UTC)[reply]

That's a document written by a company that wants to sell some kind of supplement product containing "19NorDehydroepiandrosterone", not really a reliable source. Of all the references listed in that document, are there any that actually mention this chemical compound? ChemNerd (talk) 22:58, 26 August 2010 (UTC)[reply]

There's one that mentions the diketone in the very title. I don't see why we shouldn't assume good faith for the FDA submission: it's not as if this is an improbable chemical compound. What it does to you is another matter, but I don't intend on trying it to find out ;) Physchim62 (talk) 23:21, 26 August 2010 (UTC)[reply]

There are 22 references in the document, and the closest that one can get to having useful verification of the compound is a single reference that only mentions a related compound. I know about the AGF policy, but there is definitely something wrong here. Can anyone verify that this chemical compound has ever been mentioned in the scientific literature or a secondary source independent of commercial interest? ChemNerd (talk) 00:09, 27 August 2010 (UTC)[reply]

I suppose a SciFinder search of the structure would settle the question easily, but I don't have institutional access now.--Rifleman 82 (talk) 04:04, 27 August 2010 (UTC)[reply]

I have done a SciFinder search. A search on the terms "19NorDehydroepiandrosterone", "19-Nordehydroepiandrosterone" and "19NorDHEA" turns up nothing. A search on the chemical structure given in the chembox leads to only two papers that mention this compound:

Kahan, Ilona L.; Juhasz, Karolin; Mindszenti, Zsuzsa. Lipids of the harderian gland of rabbits. Acta Biologica Academiae Scientiarum Hungaricae (1967), 18(3), 295-301

Poortman, J.; Vroegindewey-Jie, D.; Thijssen, J. H. H.; Schwarz, F. Relative binding affinity of androstane and C-19-norandrostane-steroids for the estradiol-receptor in human myometrial and mammary cancer tissue. Molecular and Cellular Endocrinology (1977), 8(1), 27-34

I don't have access to the 1967 Hungarian paper. In the 1977 paper, the compound is just one of many compounds in a list of those tested for activity against estradiol receptors in certain cancer tissues. Overall, I wouldn't say there is anything remotely notable about this compound based on this search. And there is certainly nothing in the scientific literature that backs the content of the article. Consequently, I have nominated the article for deletion: Wikipedia:Articles for deletion/19-Nordehydroepiandrosterone.--Ed (Edgar181) 12:36, 27 August 2010 (UTC)[reply]

I'm not sure why Beetstra removed the verified tags, which placed on the PubChem, and ChemSpiderID parameters. The article does not specify a particular isomer, so I assumed that it was refering to the racemate. The image only represents one isomer, which I stressed in the caption. I verified the racemate identifiers personally, I don't add the PubChem and ChemSpiderID if they don't exist. I'd appreciate a cleared reason than what was given in the edit summary.--Plasmic Physics (talk) 13:28, 27 August 2010 (UTC)[reply]

History for Tetrapropylammonium perruthenate is in the disambiguation article TPAP

The history for Tetrapropylammonium perruthenate is in the disambiguation article TPAP - should it be fixed and what is the procedure? --Christian75 (talk) 11:22, 2 September 2010 (UTC)[reply]

Ok, should be fixed. --Rifleman 82 (talk) 11:51, 2 September 2010 (UTC)[reply]

Neutronium Categories

There are two categories associated with neutronium that are of concern: (Category:Neutronium) and (Category:Isotopes of neutronium). Should the former be deleted? Should the Consideration for deletion for the later be reopened? Should the redirect (Isotopes of neutronium) be deleted? Note that User:Headbomb was involved in what appears to be soap boxing by promoting a scientific notion as actual fact. He may still be promoting it. For information on the topic refer to Neutronium.--Plasmic Physics (talk) 12:14, 2 September 2010 (UTC)[reply]

This has been a point of contention at that article for quite a while. Relevant threads are:

Talk:Neutronium#Disputed: Periodic table (2005)
Talk:Neutronium#Nnneologism? (2006)
Talk:Neutronium#Neutronium: The Uncommon Element (2008/2009)
Talk:Neutronium#References (2009)
Talk:Neutronium#Infobox (2010)

My own take is that declaring "neutronium" to be an element was a proposal that was historically noteworthy, but that it isn't considered an element by any significant fraction of the scientific community today. The historical proposal is already covered in its own section in the article. --Christopher Thomas (talk) 17:21, 7 September 2010 (UTC)[reply]

First, I'm not soapboxing, nor promoting a "scientific notion as actual fact", please so please stop misrepresenting me as some POV-pusher. If anything, your actions could very well be construed as forum shopping. There is an ongoing CfD about this, and getting an project unconcerned with the article and related categories like WikiProject Chemicals to chip in the discussion is pretty damn close to canvassing. The relevant projects are WikiProject Elements and to some extent WikiProject Physics and WikiProject Chemistry. Headbomb {talk / contribs / physics / books} 21:45, 7 September 2010 (UTC)[reply]

I've de-indented this by one level, as I am assuming it to be a response to the original poster, not me. With regards to forum-shopping, bringing it to the attention of WP:CHEM is reasonable, as the debate over whether any significant number of scientists consider "neutronium" to be a chemical element (and so able to have isotopes) is very much within the jurisdiction of this wikiproject (in addition to that of WP:PHYS). This is a common enough state of affairs (look at all of the dark matter and black hole threads that get cross-posted between WT:PHYS, WT:ASTRO, and WT:AST), so calling it forum-shopping is a bit of a stretch. If anyone is acting inappropriately, misrepresenting other users' actions, or editing against consensus, I'm sure it'll rapidly become clear without accusations of forum shopping being needed. --Christopher Thomas (talk) 23:02, 7 September 2010 (UTC)[reply]

For anyone interested, the deletion discussion is at Wikipedia:Categories_for_discussion/Log/2010_September_2#Category:Neutronium. -- Ed (Edgar181) 22:44, 7 September 2010 (UTC)[reply]

A nucleus containing only neutrons would not have any electrons bound to it and thus could not be considered as forming an atom, nor could it participate in chemical reactions. So I would not call it a chemical element. Also, according to the article neutronium, only a single isolated neutron would have any significant lifetime.

A neutron star is gravitationally bound rather than bound by the strong force, so it is not a nucleus as usually understood. Also a neutron star would undoubtedly contain many other particles including protons, so its atomic number would not be zero. JRSpriggs (talk) 23:41, 7 September 2010 (UTC)[reply]

I don't see why its lifetime would matter, we deal with theoretical elements that last microseconds and less already. We also deal with things that are not stable at STP, like post-perovskite, metallic hydrogen, etc. 76.66.197.151 (talk) 05:28, 8 September 2010 (UTC)[reply]

A nucleus containing only neutrons is a nucleus, hence part of nuclear physics, rather than chemistry, which only deals with its consequences in relation to the effect on electrons. As for not taking part in chemical reactions, the formerly named "inert elements" were previously thought to not participate in them either, but were still called elements. (AFAIR, Helium still does participate in chemical reactions, unless ionized). The concept of an element zero / neutronium / neutron-only element recently cropped up in the press-garnering "Chemical Galaxy" popsci periodic table, so this concept does have currency. As all unmade elements are theoretical, that is not a bar to having articles. If there are articles, then categories can be made for them. Even were neutronium/neutron-only element considered obsolete, that would not be a bar to categorization either, since we categorize alot of obsolete science into their own categories. Hell, UFOlogy has their own categories, but a real scientific proposal can't have its own category? 76.66.197.151 (talk) 05:26, 8 September 2010 (UTC)[reply]

Related to this subject, I have nominated {{Infobox neutronium}} for deletion at WP:TFD. Icalanise (talk) 15:26, 12 September 2010 (UTC)[reply]

Bot for adding images

A bot could be written for generating models/diagrams for infoboxes based on IUPAC and common name nomenclature. Would anyone support such a request for a bot (until something like jmol is implemented)?Smallman12q (talk) 23:00, 4 September 2010 (UTC)[reply]

Are we lacking images for many infoboxes? I think most of them have had images generated by one of our editors already. Some judgment is necessary, and maybe this should not be automated. --Rifleman 82 (talk) 03:36, 5 September 2010 (UTC)[reply]

I agree with Rifleman 82 here. Often there is a need for a human to draw the structure in an attractive but concise way. Having seen how structure drawing programs can botch a structure when generating them from InChIs etc, I'd rather stick to a human editor for this part. However, a bot to check things like IUPAC naming and InChIs would perhaps be a good idea, using the CAS database as a starting point. Cheers, Walkerma (talk) 04:58, 5 September 2010 (UTC)[reply]

(i) There are 288 articles in the Category:Chemical_pages_needing_a_structure_drawing, mostly inorganic solids (where robots would fail). The category is autoupdated with articles which have chembox and no any picture in it. (ii) I don't think any bot can handle this automatically. Materialscientist (talk) 05:14, 5 September 2010 (UTC)[reply]

Worth saving?

Does Jensenite have a chance of being salvaged into an actual article (or suitable redirect)? Dabomb87 (talk) 04:22, 13 September 2010 (UTC)[reply]

The entire contents was "Cu3TeO6•2(H2O)" - I'd suggest starting from scratch... Skier Dude (talk 04:24, 13 September 2010 (UTC)[reply]

You can also recreate as a redirect - you all would know the best target. Skier Dude (talk 04:26, 13 September 2010 (UTC)[reply]

Nomenclature question...

I have been asked on my talk page whether "there a difference between rhodocene and 1-rhoda-1,1'-spirobi[pentacyclo[2.2.0.0^1,3.0^1,5.0^2,6]hexane". I have not seen a name like this used for a metallocene before, and am unsure of the answer, so I am asking if anyone here is willing to offer their view. Thanks. EdChem (talk) 08:58, 13 September 2010 (UTC)[reply]

The spiro name implies that there is a single bond from each of the carbon atoms to the rhodium atom. In inorganic nomenclature, it would be bis(cyclopentane-1,2,3,4,5-pentayl-κ⁵C^1,2,3,4,5)rhodium. Rhodocene, on the other hand, is an acceptable shorthand for bis(η⁵-cyclopentadienyl)rhodium, which is in itself a universally used shorthand for the full systematic name, bis(η⁵-cyclopenta-2,4-dien-1-yl)rhodium. So the spiro name is incorrect, as it implies ten pairs of bonding electrons; rhodocene, and other names using or implying the η-convention, are correct because they only imply 2×5 carbon atoms taking part in the π-systems that bond to the rhodium (there are six pairs of electrons that take part in metal–ligand bonding in metallocenes). As a final point, the rhodocene names are only appropriate of the low-temperature species; at room temperature, the chemistry is more complex (see article for details). Physchim62 (talk) 12:33, 13 September 2010 (UTC)[reply]

He wrote that article :-P Materialscientist (talk) 12:53, 13 September 2010 (UTC)[reply]

Thanks, Physchim, both for the explanation here and at my talk page. As Materialscientist notes, I wrote the article rhodocene which is probably why the original question was directed to me in the first place. :) It's gratifying to see others have read the page! EdChem (talk) 13:23, 13 September 2010 (UTC)[reply]

Dioxins and furans

Someone created this article by copying from the EPA website (so it's not a copyvio), but it's hardly encyclopedic. Someone added a PROD tag to it, but folks here might want to keep an eye on it. Regards, P. D. Cook ^{Talk to me!} 19:58, 13 September 2010 (UTC)[reply]

Caesium titanate

Hello chemistry fans.

An article on caesium titanate has recently appeared, written by User:YOSF0113. It gives the formula as Cs₂TiO₃, but a quick search of crystallographic databases for substances containing only Cs, Ti and O shows no sign of Cs₂TiO₃. Instead, there are 25 hits, including such stoichiometries as Cs₂Ti₅O₁₁, Cs_0.132TiO₂, Cs_1.1Ti₈O₁₆ and Cs₂Ti₄O₉.

Any suggestions? My guess is that User:YOSF0113 wanted to make a new article, saw existing ones such as barium titanate (BaTiO₃), and thought that Ba²⁺ could easily be replaced by 2Cs⁺. This is one of the pitfalls of extrapolating without experimental confirmation - WP:OR/WP:SYN?

Ben (talk) 13:12, 19 September 2010 (UTC)[reply]

Well, the stoichiometry Cs₂TiO₃ makes perfect sense - caesium in its +1 state, titanium in its +4 state, etc. However, the CAS registry number appears to be unassigned, nor do searches for a CAS no. for "caesium titanate" or "cesium titanate" show a result. YOSF0113 is giving specific hazard information, which I suspect is coming from somewhere (as presumably did the CAS number) but with no references it is impossible to check sources. I suggest you ask the editor about sources of information directly. Also, I have serious doubts about the molecule-like structure shown, a true polymeric inorganic salt structure seems much more likely. EdChem (talk) 13:37, 19 September 2010 (UTC)[reply]

Caesium titanate another example of a self-indulgent article, with no serious intent to serve. Such articles are harmless, so long as they are not allowed to imply importance (WP:UNDUE). We used to delete them on grounds of notability. Suggestions: caesium titanate be rewritten much more vaguely or (more efficiently) converted to a redirect.--Smokefoot (talk) 14:08, 19 September 2010 (UTC)[reply]

The stoichiometry Cs₂TiO₃ doesn't make perfect sense at all. You get BaTiO₃ because it forms a nice stable perovskite structure (perovskite itself is CaTiO₃), but you can't do that with two M⁺ cations. Now you can form a material with the stoichiometry Cs₂TiO₃ – that's just a question of heating equimolar quantities of Cs₂CO₃ and TiO₂ – but is it a single phase? There's a company that sells it, so I'll ask them! Incidentally, because there is a company that sells it, the "compound" has found its way onto many databases: ChemSpider, PubChem, EINECS.

I would suggest transforming this article into a piece about caesium hexatitanate, Cs₂Ti₆O₁₃, which is definitely a single phase with a nice layer structure (doi:10.1016/0022-4596(85)90217-8) and appears to have some use in materials science; it is also sold by Aldrich, which is an indication that someone uses it for something. Alternatively, we could write something about caesium titanates in general, but that would need more research. Physchim62 (talk) 15:37, 19 September 2010 (UTC)[reply]

Physchim62, I disagree about Cs₂TiO₃. I completely agree that that stoichiometry makes no sense for a perovskite, but then it is only Ben's suggestion that YOSF0113 started from barium titanate. I see no reason why Cs₂TiO₃ is an unreasonable composition for a non-perovskite structure. As you suggest, heating caesium carbonate and titanium dioxide should produce a single phase Cs₂TiO₃, if it exists, but even if it doesn't that wouldn't be conclusive proof of the non-existence of Cs₂TiO₃. On what to do with the article, making it about the hexatitanate sounds viable, or keeping it about Cs₂TiO₃ assuming sufficient reliable information about it can be found. EdChem (talk) 15:56, 19 September 2010 (UTC)[reply]

Sorry, I should have made myself clearer! I wasn't pretending to have proof that Cs₂TiO₃ doesn't exist – the chemical literature is full of descriptions of compounds that "shouldn't exist" but do! I was merely pointing out that the naïve extrapolation from BaTiO₃ is invalid. Personally, I don't think Cs₂TiO₃ does exist, because these compounds have obviously been studied and we can't find a crystal structure for it, but that's just a personal opinion. The fact that you say that 12158-57-5 appears to be unassigned as a CAS number makes me doubt the existence even more: I can't believe that people just made this CAS number up, when they are quoting it in regulatory situations such as the EINECS list, so that would imply that the number has been deleted from the CAS registry. Physchim62 (talk) 16:23, 19 September 2010 (UTC)[reply]

Gyromitrin

Hello, I'd like to bring the above article to GA status, but have never done so with an article on a chemical (I admit, I'm only interested because it's made by fungi). I'd highly appreciate it if any members of this project could have a quick look and see if there's anything obvious I'm missing that should be included. Thanks! Sasata (talk) 16:09, 19 September 2010 (UTC)[reply]

From a quick look, issues that occur to me / things to consider:

The compound has (E) and (Z) isomers, but which comments apply to which isomers is not specified
I suspect that the laboratory synthesis of the compound(s) are described in the literature; these should be described
Is there undue weight on the information about the fungus, etc, as opposed to the compound?
Is it worth considering a section on the "Properties" of the compound, or maybe a "History" section?
The references are not consistently formatted
Does the lede summarise all of the article?

EdChem (talk) 16:30, 19 September 2010 (UTC)[reply]

Thanks very much! I will think about these issues and work on them. (will copy your list over to the article talk page for convenience). Sasata (talk) 16:46, 19 September 2010 (UTC)[reply]

Chemicals articles have been selected for the Wikipedia 0.8 release

Version 0.8 is a collection of Wikipedia articles selected by the Wikipedia 1.0 team for offline release on USB key, DVD and mobile phone. Articles were selected based on their assessed importance and quality, then article versions (revisionIDs) were chosen for trustworthiness (freedom from vandalism) using an adaptation of the WikiTrust algorithm.

We would like to ask you to review the Chemicals articles and revisionIDs we have chosen. Selected articles are marked with a diamond symbol (♦) to the right of each article, and this symbol links to the selected version of each article. If you believe we have included or excluded articles inappropriately, please contact us at Wikipedia talk:Version 0.8 with the details. You may wish to look at your WikiProject's articles with cleanup tags and try to improve any that need work; if you do, please give us the new revisionID at Wikipedia talk:Version 0.8. We would like to complete this consultation period by midnight UTC on Monday, October 11th.

We have greatly streamlined the process since the Version 0.7 release, so we aim to have the collection ready for distribution by the end of October, 2010. As a result, we are planning to distribute the collection much more widely, while continuing to work with groups such as One Laptop per Child and Wikipedia for Schools to extend the reach of Wikipedia worldwide. Please help us, with your WikiProject's feedback!

For the Wikipedia 1.0 editorial team, SelectionBot 22:14, 19 September 2010 (UTC)[reply]

WPChem worklist articles have been selected for the Wikipedia 0.8 release

Version 0.8 is a collection of Wikipedia articles selected by the Wikipedia 1.0 team for offline release on USB key, DVD and mobile phone. Articles were selected based on their assessed importance and quality, then article versions (revisionIDs) were chosen for trustworthiness (freedom from vandalism) using an adaptation of the WikiTrust algorithm.

We would like to ask you to review the WPChem worklist articles and revisionIDs we have chosen. Selected articles are marked with a diamond symbol (♦) to the right of each article, and this symbol links to the selected version of each article. If you believe we have included or excluded articles inappropriately, please contact us at Wikipedia talk:Version 0.8 with the details. You may wish to look at your WikiProject's articles with cleanup tags and try to improve any that need work; if you do, please give us the new revisionID at Wikipedia talk:Version 0.8. We would like to complete this consultation period by midnight UTC on Monday, October 11th.

We have greatly streamlined the process since the Version 0.7 release, so we aim to have the collection ready for distribution by the end of October, 2010. As a result, we are planning to distribute the collection much more widely, while continuing to work with groups such as One Laptop per Child and Wikipedia for Schools to extend the reach of Wikipedia worldwide. Please help us, with your WikiProject's feedback!

For the Wikipedia 1.0 editorial team, SelectionBot 23:49, 19 September 2010 (UTC)[reply]

Psoralen#Biosynthesis

The section Psoralen#Biosynthesis refers to two diagrams that are missing. Looking at the history, it looks like the diagrams have been deleted. Would an admin please have a look at them and see whether they are worth re-creating? Alternatively, the section needs a re-write, preferably by someone with good structural diagrams relating to shikimate biosynthesis from which to work. Thanks. EdChem (talk) 07:14, 20 September 2010 (UTC)[reply]

Although I didn't do this section of the article, and I'm not an admin, I'd be happy to try creating some diagrams if the old ones can't be rescued or are wrong. Walkerma (talk) 13:06, 20 September 2010 (UTC)[reply]

I have temporarily restored the two files, File:Psoralen Biosynthesis 1.jpg and File:Psoralen Biosynthesis 2.jpg, if anyone wants to take a look. -- Ed (Edgar181) 13:27, 20 September 2010 (UTC) Update: Because the files do not have the required permissions I have had to redelete them. New images can be generated from the information in Rifleman's link below. -- Ed (Edgar181) 11:45, 2 October 2010 (UTC)[reply]

It seems (from threads at their uploader's talk page) that they were deleted due to lack of licensing information, so creating new diagrams from scratch conveying the same information as the old ones is probably best. The old ones cite a book reference, so there will always be a concern that they're cleaned-up scans (though I consider that unlikely myself). --Christopher Thomas (talk) 18:01, 20 September 2010 (UTC)[reply]

Just as well. They can be improved to meet prevailing community standards with regard to file format, resolution, etc. in the process.--Rifleman 82 (talk) 19:18, 20 September 2010 (UTC)[reply]

These are definitely not book scans, we've seen plenty of those on this project! But they can be redrawn without too much trouble and with a clear license, so let's do that. Physchim62 (talk) 20:14, 20 September 2010 (UTC)[reply]

Does anyone have access to the book? That would be best, rather than redrawing what has been redrawn from a book. --Rifleman 82 (talk) 20:46, 20 September 2010 (UTC)[reply]

The problem is that if the original contributor doesn't step forward and say "I drew these, and release them under (some acceptable license)", the images might still be declared unacceptable. I agree that blessing the existing images is the path of least work, but redrawing them is IMO likely to be the path of least red tape. --Christopher Thomas (talk) 21:43, 20 September 2010 (UTC)[reply]

I actually meant that they should still be redrawn, but with reference to the actual book to reduce the chance for errors. It's available on Google Books [9], so if anyone can help... I could but I prefer that someone who actually understands do it. --Rifleman 82 (talk) 22:48, 20 September 2010 (UTC)[reply]

I concur with Rifleman, redrawing from the original sounds best. Also, thanks to Ed for undeleting and showing us what the figures were. Walkerama, if you want to take on the project, that would be great. EdChem (talk) 03:54, 23 September 2010 (UTC)[reply]

GA and A-class

Would someone please explain how GA-status and A-class interact? Rhodocene has just been promoted to WP:GA status, but is still listed as B-class. I've been trying to figure out what is separate / different about A-class that isn't covered by GA, but I'm struggling. Thanks. EdChem (talk) 04:00, 23 September 2010 (UTC)[reply]

Sunday puzzle - CO2 scrubber material for astronauts

I was going to mention in lithium hydroxide that it is/was used on the Apollo missions and related space ventures. But does anyone here know? "CO2 scrubber" redirects to Rebreather, and makes no mention of use in space.--Smokefoot (talk) 19:56, 26 September 2010 (UTC)[reply]

I think it was lithium peroxide that was used: I'll see if I can find a reference or that. Physchim62 (talk) 20:55, 26 September 2010 (UTC)[reply]

Yep, it's the peroxide, according to Greenwood & Earnshaw: the peroxide actually gives you oxygen back as well as absrobing the CO₂. Physchim62 (talk) 20:58, 26 September 2010 (UTC)[reply]

Covalent network solids

Can anyone explain how covalent network structures terminate, how is the nature of bonding different in the surface as opposed to the bulk structure. If you can, please use diamond and quartz as examples.--Plasmic Physics (talk) 10:45, 26 September 2010 (UTC)[reply]

Diamond probably has C–H bonds on its surface. Quartz has surface silanol groups, Si–OH, but these are surface ionisable groups and so there is a mix of Si–O⁻, Si–OH, and Si–OH₂⁺ groups on the surface. The distribution depends on the environment. The point of zero charge occurs when the surface concentrations of Si–O⁻ and Si–OH₂⁺ are equal. EdChem (talk) 11:02, 26 September 2010 (UTC)[reply]

Can look up my files, but what I recall is that first, these surfaces reconstruct, i.e. in ideal structure (which is experimentally observed in high-quality clean experiments), the bonding in the last layer differs from that in the bulk, with various dimer configurations present or not depending on the surface orientation (the jargon for that is axb reconstruction, where a and b are integers, e.g. 2x1). Their chemical termination is a function of the surface preparation. In diamond and silicon, typical terminations are C-H, C=O, CH₂ and C-O-C. The reconstruction may create supercells on the surface with the "lattice constant" much larger than the bulk lattice constant. Materialscientist (talk) 11:16, 26 September 2010 (UTC)[reply]

now that is a great question seldom asked - in classes and books, chemists mainly discuss the interior of crystals, not their exteriors. For molecular solids reconstruction involves no new bonds, but for nonmolecular solids, including boring old NaCl, things are very different.--Smokefoot (talk) 16:32, 26 September 2010 (UTC)[reply]

The topic certainly comes up often in semiconductor research. Surface effects can give you defects that trap carriers, and bonds that don't match the chemistry of the bulk material add states inside the bandgap that can cause problems. The latter caused considerable difficulty with silicon nanocrystal research until they figured out what was happening.

User:Materialscientist gives a good description of what happens when you have a crystal edge that's been passivated by its environment. In vacuum, you can get dangling bonds that stay around for a while (due to absence of relaxation mechanisms). Among other things, this is what causes vacuum cementing (touching two cleaved surfaces back together causes them to stick as some of the dangling bonds react with each other). --Christopher Thomas (talk) 21:02, 26 September 2010 (UTC)[reply]

Interisting replies. So, if the solid is created under a vacuum, it is essentially a highly reactive polyradical that reacts with just about any surface it contacts; being under atmospheric conditions passivates the radical moeities? Are there some covalent network solids that are not polyradicals when created in a vacuum, and can exist in a stable unpassivated form under atmosphere.--Plasmic Physics (talk) 21:26, 26 September 2010 (UTC)[reply]

Yes, dangling bonds remain and the solid surface is highly reactive in vacuum. On the fly, I don't know any inorganic covalent solid which would heal itself. Diamond could, at elevated temperature, by transforming into graphite, but the required reconstruction would be too complex and involve many atomic layers - it would not be a usual reconstruction but rather a heterostructure of diamond and some graphite-like structure. Materialscientist (talk) 22:19, 26 September 2010 (UTC)[reply]

Possibly. Non-covalent substances like metals almost certainly can do this. Some covalent substances may self-passivate to some degree by forming bonds of different types than those normally found within the crystal. I'd expect diamond and silicon to do this to some degree; at minimum diamond should be able to form graphite-style pi bonds at the surface, though it'll still be reactive (just without dangling bonds). That said, I defer to User:Materialscientist's expertise (it's possible I'm mistaken). --Christopher Thomas (talk) 21:49, 26 September 2010 (UTC)[reply]

I'm doing a Bachelor of nanoscience degree, so I find this really interisting. On the quartz note: is the surface structure responsible for the hydrophilicity of laboratory glassware? Is it related to the catalytic behaviour of zeolites?--Plasmic Physics (talk) 23:24, 26 September 2010 (UTC)[reply]

ABSOLUTELY (and then more so!) sorry for shouting ;) If you want to make your laboratory glassware much less hydrophilic, just rinse it around with a bit of trimethylsilyl chloride: if you're brave, you can even add a drop or two of (bone dry) triethylamine to the mix. Physchim62 (talk) 23:45, 26 September 2010 (UTC)[reply]

Well... that your glass is hydrophilic is a traditional check that it is clean (water sheets off easily). That you don't have lipophilic organic crap left on the surface. I have seen an alternate procedure to cap the hydroxyls with TMS-Cl by putting everything in an oven, with a few mL of TMS-Cl in a beaker. --Rifleman 82 (talk) 16:21, 2 October 2010 (UTC)[reply]

A well-known chemical company will even supply you with a ready-made solution for coating glassware with TMS groups: apparently the protein crystallographers use it quite a bit – or so a protein crystallographer told me when he suggested this as a solution to my adsorption problem (an inorganic anion that was adsorbing onto the glass surface to such an extent that it was messing up my analyses). Physchim62 (talk) 16:44, 2 October 2010 (UTC)[reply]

Cojugation of pi bonds can only take you so far, in terms of dispersing the radical electrons, like a game of musical chairs. A graphene sheet may not have a polyradical surface, but it has an edge, giving you the same problem in a different light.--Plasmic Physics (talk) 23:35, 26 September 2010 (UTC)[reply]

The "edge problem" is a big issue when you come you use practical graphite powders, rather than just thinking in terms of the idealized structure. To add a comment to you question "are there any solids…", I don't think so, but I think the nearest you'd come is with one of the allotropes of boron – these are already "electron-deficient" for normal covalent bonding, so I would imagine that they would accomodate the surface better. In fact, the accomodate surfaces so well that it is extremely difficult to crystallize them! That's the trade-off, I'm afraid… Physchim62 (talk) 23:45, 26 September 2010 (UTC)[reply]

Think real. It is extremely difficult to bond graphene to a crystal, even in theory. "Graphite-like" on diamond always means short-range order, i.e. local sp2 reconstructions, it is quite messy in the long range. Any amorphous surface can self-heal. Crystalline boron has several allotropes, some with rather complex structure. I know some of them do have ordered surface, but I know no evidence that they can self-heal without hydrogen. Materialscientist (talk) 00:24, 27 September 2010 (UTC)[reply]

Ants

I inadvertantly boiled ants, when they decided that a the cavity within a kettle lid is a convenient nesting site. I only noticed it after the kettle has boiled. Now the kettle is contaminated with a persistent and repulsive smell and taste. I've rinsed it with fresh water repeatedly, I've boiled a detergent solution in it, ultimately I can't seem to remove this contaminant. Any ideas what the chemical is and how to remove it, I thought it could be formic acid, but considering how difficult it is to remove, this seems unlikely. In my opinion, it smells like a mixture of acrylate, bread mould and dirt. Any water boiled in it gains that smell and taste which, has not happened before this event.--Plasmic Physics (talk) 11:41, 17 October 2010 (UTC)[reply]

My best suggestion is to soak the whole thing in bleach. Also, the reference desk (WP:RD) is probably the best location for questions like this. --Christopher Thomas (talk) 17:56, 17 October 2010 (UTC)[reply]

Shoe Goo

The article Shoe Goo could stand to be looked at by somebody with a chemistry background. The material is called variously a polymer, a polyurethane-based product, and individual chemical components are mentioned. Without getting overly complex, would it be possible to make sure that the product is being characterized properly? Thanks. Carrite (talk) 20:17, 17 October 2010 (UTC)[reply]

Sounds like a polyurethane which crosslinks slowly when applied. Toluene and naphtha are merely solvents to dissolve everything. --Rifleman 82 (talk) 20:46, 17 October 2010 (UTC)[reply]

Definition of applications

I was reading the article Iridium and noticed that it has a section discussing C-H activation with a reaction scheme. This particular reaction is not and has not been used for anything, aside from generating some nice publications. So I was going to move this bit to the compounds section, since it is not an application. The section in question is "Carbon–hydrogen bond activation (C–H activation) is an area of research .."

Now the more general question/assertion: we dont define "research" as applications, do we? Agreeing or discussing the definition(s) of application has broader implications for Wikipedia-Chemistry. My vote is that under applications, when we discuss compounds/elements that are actually being used, usually commercially but not always. But I get the feeling that others might disagree.--Smokefoot (talk) 00:25, 23 October 2010 (UTC)[reply]

IMO, "laboratory research" applications should not be mixed with industrial ones, but many cases are to be treated individually. Imagine a compound (say DPPH, though it might be a bad example) which is not studied on its own, and is not used by ordinary people, and is sold as a chemical rather than tool, but is widely used as a "tool" in the lab for some specific purpose (e.g. DPPH is the most common EPR standard + radical marker). Materialscientist (talk) 00:38, 23 October 2010 (UTC)[reply]

C-H activation is a very specialised topic and should not be mentioned on the iridium page. Ideally there should be a separate page on iridium compounds and then iridium C-H activation should be handled by the organoiridium page. With respect to applications: if a compound is commercially available it should be mentioned. With respect to commercially relevant reactions: aside from bulk chemistry it is virtually impossible to obtain information (trade secrets, if a patent exists it does not mean it is used in production, is the Negishi coupling used in industry? ). Academic research can be handled under scope. Finally: I would hate to see science banned from Wikipedia, there is more in life than just useful applications V8rik (talk) 23:24, 23 October 2010 (UTC)[reply]

- I think a lot depends on the context. I agree that applications such as the C-H activation section are too specialised for the iridium article, but if its an article like 1,1'-Bis(diphenylphosphino)ferrocene, then the applications are likely to be laboratory-based. I've always taken the view that "if plenty of other people (besides the originators) use it for that, then it counts as an application". For example, plenty of people besides Evans use oxazolidinones as chiral auxiliaries, so it's appropriate to mention that application on the 2-Oxazolidone page. But if it's mainly just used by the group that developed it, it's not really an application - it's just scientific research.

- A couple of other comments: (1) I don't think C-H activation is very specialised any more. At our NERM conference in June, about half of the speakers in the organic chemistry sessions were talking about their work in that area, and a glance at Organic Letters will show how mainstream it's become. My impression is that it's currently a very hot area in organic, at least in the US. (2) The borylation (is that the right word, v8rik?) of arenes with an iridium catalyst, as described here, is beginning to be used - it's probably not worth mentioning on the iridium page, but it may be a significant application of this type of chemistry. Walkerma (talk) 02:41, 24 October 2010 (UTC)[reply]

Phase Diagrams

I think that it is a good idea to accumulate phase diagrams for the elements and maybe simple substances, as wikipedia has surprisingly few.-Plasmic Physics (talk) 07:27, 26 October 2010 (UTC)[reply]

Ates

Many of us are careful to not allow nomenclature detract from the functionality of articles. But the issue comes up all the time. For example, Wikipedia has a fine article on phosphate. In the lead paragraph, it would probably be unhelpful/distracting to remind readers that the term "phosphate" is not reserved for oxides, e.g. PCl₆^-. We can be sure that >99.99% of phosphate readers are disinterested in the halophosphates, I assume. I ran into this problem in searching for titanates, and encountering [TiCl₆]^2-. So the article titanate begins with a short disclaimer that the term can be used more broadly but the article is about the oxides. IUPAC does not apparently define phosphate, but what about "-ates"? — Preceding unsigned comment added by Smokefoot (talk • contribs) 15:12, 30 October 2010 (UTC)[reply]

IUPAC defines phosphate as PO³⁻
₄ on page 325 of International Union of Pure and Applied Chemistry (2005). Nomenclature of Inorganic Chemistry (IUPAC Recommendations 2005). Cambridge (UK): RSC–IUPAC. ISBN 0-85404-438-8. Electronic version.. The use of "-ate" is on page 72 of the same reference: in formal terms, it the suffix is used in additive nomenclature to denote any heteropolyatomic anion ("-ide" is used for monoatomic and homopolyatomic anions). Physchim62 (talk) 18:23, 30 October 2010 (UTC)[reply]

Perfect. So phosphate is and only is PO₄^3-, and no need exists in the phosphate article to indicate that PF₆^- is a phosphate, because it is not: it is hexafluorophosphate (or, using their ignored recommendation, hexafluoridophosphate). Thanks.--Smokefoot (talk) 18:58, 30 October 2010 (UTC)[reply]

Hexachlorophenol

IMHO the name hexachlorophenol is incorrect, because it is not a phenol anymore. The CAS database lists the compound as 2,3,4,4,5,6-hexachloro-2,5-cyclohexadien-1-one. Hexachloro-2,5-cyclohexadienone would be a shorter alternative. Any comments? --Leyo 14:48, 5 November 2010 (UTC)[reply]

The name doesn't bother me to much – we can always add a sentence saying that it's not really a phenol – but the compound doesn't seem to be at all notable, evn by our low standards of notability! Physchim62 (talk) 15:07, 5 November 2010 (UTC)[reply]

The name bothers me - a phenol is an aromatic alcohol. This compound is neither aromatic nor an alcohol, it's a cyclic ketone. Unfortunately, if there are multiple RS that use the name, the fact that it is chemically inappropriate would not be a reason not to at least record it as an alias. Also, I share Physchim62's concerns on notability, there doesn't seem anything particularly significant about the compound asserted in the article. EdChem (talk) 15:19, 5 November 2010 (UTC)[reply]

"Hexachlorophenol" is a valid synonym in the sense that this name is used in the scientific literature (one of the earliest references is a US patent titled "Hexachlorophenol"). But I agree that it is certainly misleading. As for the notablity, SciFinder returns 86 hits on the compound which is more than for many other compounds that we have articles for. I haven't looked closely to see if many of these 86 hits are more than passing references though. -- Ed (Edgar181) 15:28, 5 November 2010 (UTC)[reply]

IMHO the article should be moved to a more appropriate name (which one?), but deletion is not necessary. --Leyo 15:38, 5 November 2010 (UTC)[reply]

Hexachloro-2,5-cyclohexadienone is unambiguous, it's the name I would use. EdChem (talk) 16:17, 5 November 2010 (UTC)[reply]

Links to alcohol

I notice that most of the articles listed at "What links here" for alcohol really should link to alcoholic beverage. Is there any good and easy way of fixing these using one of Wikipedia's many tools or gadgets? ChemNerd (talk) 16:12, 5 November 2010 (UTC)[reply]

Wow, you're right. I doubt people browsing the Drew Barrymore page are really looking for an education in organic chemistry. One way to fix this might be to load a list of pages that link to alcohol in AWB, filter out all pages with chemistry categories, then update the link (checking each change for appropriateness, of course.) I'll take a stab at doing that on Thursday if no one else volunteers or can think of a better approach. 28bytes (talk) 03:12, 10 November 2010 (UTC)[reply]

I was thinking of doing an AWB run as well. I guess it's a big problem (I haven't actually looked, it scares me too much!) so help from anyone who runs AWB would be appreciated! If we all do a run until we get too comatose, we should be able to fix it quite quickly... Physchim62 (talk) 03:31, 10 November 2010 (UTC)[reply]

Okay... I'll try to dust off my bot account and do a run. --Rifleman 82 (talk) 03:58, 10 November 2010 (UTC)[reply]

OKay, this is not a trivial problem. There are 3k articles, and it's taking some time to filter out the chemistry articles. I'll work on it over the week. Advantage is that with a bot flag, we don't clutter up watchlists. --Rifleman 82 (talk) 04:14, 10 November 2010 (UTC)[reply]

Thanks 28bytes, Physchim and Rifleman. If there is anything I can do to help (without access to AWB), let me know. ChemNerd (talk) 13:53, 10 November 2010 (UTC)[reply]

True pyrrole?

Check out this pair: True Pyrrole, not to be confused with pyrrole. --Smokefoot (talk) 00:49, 10 November 2010 (UTC)[reply]

The article's creator is a good faith contributor, so I don't see how this is the result of anything but some misconception. I think it should just be redirected to pyrrole. -- Ed (Edgar181) 12:22, 10 November 2010 (UTC)[reply]

Good idea about the redirect: we're all behind you and hope for a happy, consensus-guided outcome.--Smokefoot (talk) 13:00, 10 November 2010 (UTC)[reply]

I've removed the hatnote on the pyrrole page. (See recursion). shoy (reactions) 14:16, 10 November 2010 (UTC)[reply]

Is "true pyrrole" supposed to be a radical?

Ben (talk) 16:37, 10 November 2010 (UTC)[reply]

It has to be one IMHO. Strangely, PubChem has an entry for this compound. --Leyo 17:25, 10 November 2010 (UTC)[reply]

Ben (talk) 19:12, 10 November 2010 (UTC)[reply]

Whilst the pyrrolyl radical might exist under certain conditions, as far as I can see "True pyrrole" is just made up. I've asked him for references, but would be suprised if any were forthcoming. Couldn't find anything on WoS or Google Scholar. Chris (talk) 21:40, 10 November 2010 (UTC)[reply]