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not necessary because the PIN is specified just above
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| ImageName2 = Ball and stick model of isopentane
| ImageName2 = Ball and stick model of isopentane
| PIN = 2-Methylbutane<ref name="IUPAC2013_652">{{cite book | title = Nomenclature of Organic Chemistry : IUPAC Recommendations and Preferred Names 2013 (Blue Book) | publisher = [[Royal Society of Chemistry|The Royal Society of Chemistry]] | date = 2014 | location = Cambridge | page = 652 | doi = 10.1039/9781849733069-FP001 | isbn = 978-0-85404-182-4 | quote = The names ‘isobutane’, ‘isopentane’ and ‘neopentane’ are no longer recommended.}}</ref>
| PIN = 2-Methylbutane<ref name="IUPAC2013_652">{{cite book | title = Nomenclature of Organic Chemistry : IUPAC Recommendations and Preferred Names 2013 (Blue Book) | publisher = [[Royal Society of Chemistry|The Royal Society of Chemistry]] | date = 2014 | location = Cambridge | page = 652 | doi = 10.1039/9781849733069-FP001 | isbn = 978-0-85404-182-4 | quote = The names ‘isobutane’, ‘isopentane’ and ‘neopentane’ are no longer recommended.}}</ref>
| OtherNames = Isopentane (no longer recommended<ref name="IUPAC2013_652"/>)
| OtherNames = Isopentane
|Section1={{Chembox Identifiers
|Section1={{Chembox Identifiers
| CASNo = 78-78-4
| CASNo = 78-78-4

Revision as of 20:24, 28 July 2019

Isopentane
Skeletal formula of isopentane
Skeletal formula of isopentane with all implicit carbons shown, and all explicit hydrogens added
Ball and stick model of isopentane
Names
Preferred IUPAC name
2-Methylbutane[1]
Other names
Isopentane
Identifiers
3D model (JSmol)
1730723
ChEBI
ChemSpider
ECHA InfoCard 100.001.039 Edit this at Wikidata
EC Number
  • 201-142-8
49318
MeSH isopentane
RTECS number
  • EK4430000
UNII
UN number 1265
  • InChI=1S/C5H12/c1-4-5(2)3/h5H,4H2,1-3H3 checkY
    Key: QWTDNUCVQCZILF-UHFFFAOYSA-N checkY
  • CCC(C)C
Properties
C5H12
Molar mass 72.151 g·mol−1
Appearance Colorless liquid
Odor Odorless
Density 616 mg mL−1[2]
Melting point −161 to −159 °C; −258 to −254 °F; 112 to 114 K
Boiling point 27.8 to 28.2 °C; 81.9 to 82.7 °F; 300.9 to 301.3 K
Vapor pressure 76.992 kPa (at 20 °C)
7.2 nmol Pa−1 kg−1
UV-vis (λmax) 192 nm
1.354
Viscosity 0.214 cP (at 20 °C)
Thermochemistry
164.85 J K−1 mol−1
260.41 J K−1 mol−1
−179.1–−177.3 kJ mol−1
~ 3.3 MJ mol−1, 19,664 Btu/lb
Hazards
GHS labelling:
GHS02: Flammable GHS07: Exclamation mark GHS08: Health hazard GHS09: Environmental hazard
Danger
H224, H304, H336, H411
P210, P261, P273, P301+P310, P331
NFPA 704 (fire diamond)
NFPA 704 four-colored diamondHealth 1: Exposure would cause irritation but only minor residual injury. E.g. turpentineFlammability 4: Will rapidly or completely vaporize at normal atmospheric pressure and temperature, or is readily dispersed in air and will burn readily. Flash point below 23 °C (73 °F). E.g. propaneInstability 0: Normally stable, even under fire exposure conditions, and is not reactive with water. E.g. liquid nitrogenSpecial hazards (white): no code
1
4
0
Flash point −51 °C (−60 °F; 222 K)
420 °C (788 °F; 693 K)
Explosive limits 1.4–8.3%
Related compounds
Related alkanes
Related compounds
 2-Ethyl-1-butanol
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
☒N verify (what is checkY☒N ?)

Isopentane, C5H12, also called methylbutane or 2-methylbutane, is a branched-chain alkane with five carbon atoms. Isopentane is an extremely volatile and extremely flammable liquid at room temperature and pressure. It is also the least dense liquid at standard conditions for temperature and pressure.The normal boiling point is just a few degrees above room temperature and isopentane will readily boil and evaporate away on a warm day. Isopentane is commonly used in conjunction with liquid nitrogen to achieve a liquid bath temperature of −160 °C. Natural gas typically contains 1% or less isopentane.[3]

Nomenclature

The traditional name isopentane was still retained in the 1993 IUPAC recommendations,[4][5] but is no longer recommended according to the 2013 recommendations.[1] The preferred IUPAC name is the systematic name 2-methylbutane. An isopentyl group is a subset of the generic pentyl group. It has the chemical structure -CH3CH2CH(CH3)2.

Isomers

Isopentane is one of three structural isomers with the molecular formula C5H12, the others being pentane (n-pentane) and neopentane (dimethyl propane)...

Uses

Isopentane is used in a closed loop in geothermal power production to drive turbines.[6]

Isopentane is used, in conjunction with dry ice or liquid nitrogen, to freeze tissues for cryosectioning in histology. [7]

References

  1. ^ a b Nomenclature of Organic Chemistry : IUPAC Recommendations and Preferred Names 2013 (Blue Book). Cambridge: The Royal Society of Chemistry. 2014. p. 652. doi:10.1039/9781849733069-FP001. ISBN 978-0-85404-182-4. The names 'isobutane', 'isopentane' and 'neopentane' are no longer recommended.
  2. ^ James Wei (1999), Molecular Symmetry, Rotational Entropy, and Elevated Melting Points. Ind. Eng. Chem. Res., volume 38 issue 12, pp. 5019–5027 doi:10.1021/ie990588m
  3. ^ Georg Hammer, Torsten Lübcke, Roland Kettner, Mark R. Pillarella, Herta Recknagel, Axel Commichau, Hans-Joachim Neumann and Barbara Paczynska-Lahme "Natural Gas" in Ullmann's Encyclopedia of Industrial Chemistry 2006, Wiley-VCH, Weinheim. doi:10.1002/14356007.a17_073.pub2
  4. ^ Table 19(a) Acyclic and monocyclic hydrocarbons. Parent hydrocarbons
  5. ^ Panico, R.; & Powell, W. H. (Eds.) (1994). A Guide to IUPAC Nomenclature of Organic Compounds 1993. Oxford: Blackwell Science. ISBN 0-632-03488-2.{{cite book}}: CS1 maint: multiple names: authors list (link)
  6. ^ Byproduct Isopentane also used in some of the LPG plant to run the boiler and generate the power. HS Orka HF Energy Plant IV
  7. ^ http://www.uab.edu/research/administration/offices/ARP/ComparativePathology/Pathology/Histopathology/TissueSubmission/Pages/Freezing-Tissues-for-Cryosectioning.aspx
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