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1,2-Bis(dimethylphosphino)ethane

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1,2-Bis(dimethylphosphino)ethane
Names
Preferred IUPAC name
(Ethane-1,2-diyl)bis(dimethylphosphane)
Other names
DMPE
ethylenebis(dimethylphosphine)
1,2-Bis(dimethylphosphino)ethane
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.155.809 Edit this at Wikidata
  • InChI=1S/C6H16P2/c1-7(2)5-6-8(3)4/h5-6H2,1-4H3 checkY
    Key: ZKWQSBFSGZJNFP-UHFFFAOYSA-N checkY
  • InChI=1/C6H16P2/c1-7(2)5-6-8(3)4/h5-6H2,1-4H3
    Key: ZKWQSBFSGZJNFP-UHFFFAOYAN
  • P(C)(C)CCP(C)C
Properties
C6H16P2
Molar mass 150.142 g·mol−1
Density 0.9 g/mL at 25 °C
Boiling point 180 °C (356 °F; 453 K)
Hazards
GHS labelling:
GHS02: FlammableGHS07: Exclamation mark[1]
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 ?)

1,2-Bis(dimethylphosphino)ethane (dmpe) is a diphosphine ligand in coordination chemistry. It is a colorless, air-sensitive liquid that is soluble in organic solvents. With the formula (CH2PMe2)2 is used as a compact strongly basic spectator ligand (Me = methyl), Representative complexes include V(dmpe)2(BH4)2, Mn(dmpe)2(AlH4)2, Tc(dmpe)2(CO)2Cl, and Ni(dmpe)Cl2.[2]

Structure of trans-CoCl2(dmpe)2 (P is ochre, Co. is blue, Cl is green.

Synthesis

It is synthesised by the reaction of methylmagnesium iodide with 1,2-bis(dichlorophosphino)ethane:[3]

Cl2PCH2CH2PCl2 + 4 MeMgI → Me2PCH2CH2PMe2 + 4 MgICl

Alternatively it can be generated by alkylation of sodium dimethylphosphide.

The synthesis of dmpe from thiophosphoryl chloride has led to serious accidents and has been abandoned.[4]

Tetramethylethylenediamine, which is more popular in synthesis, is the diamine analogue of the diphosphine DMPE. Bis(dicyclohexylphosphino)ethane is an analog that is bulkier, and also has the advantage[clarification needed] of being a solid.Bis(diphenylphosphino)ethane is an interesting reactant very similar to DMPE, with the advantage of being an excellent bidentade ligand and the possibility of the phenyl groups led to specific reaction pathways.

References

  1. ^ Sigma-Aldrich Co., 1,2-Bis(dimethylphosphino)ethane. Retrieved on 2013-07-20.
  2. ^ Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. ISBN 978-0-08-037941-8.
  3. ^ R. J. Burt; J. Chatt; W. Hussain; G. J. Leigh (1979). "A convenient synthesis of 1,2-bis(dichlorophosphino)ethane, 1,2-bis(dimethylphosphino)ethane and 1,2-bis(diethylphosphino)ethane". J. Organomet. Chem. 182 (2): 203–6. doi:10.1016/S0022-328X(00)94383-3.
  4. ^ Bercaw, J. E.; Parshall, G. W. (1985). "Preparation of Tetramethyldiphosphine Disulfide and Ethylenebis(Dimethylphosphine) (Dmpe)". Inorganic Syntheses. Inorganic Syntheses. Vol. 23. pp. 199–200. doi:10.1002/9780470132548.ch42. ISBN 9780470132548.}
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