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Hexaphenylcarbodiphosphorane

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Hexaphenylcarbodiphosphorane
Names
Other names
bis(triphenylphosphoranylidene)methane
Identifiers
3D model (JSmol)
ChemSpider
  • InChI=1S/C37H30P2/c1-7-19-32(20-8-1)38(33-21-9-2-10-22-33,34-23-11-3-12-24-34)31-39(35-25-13-4-14-26-35,36-27-15-5-16-28-36)37-29-17-6-18-30-37/h1-30H
    Key: KGZNGAKXXXNCGK-UHFFFAOYSA-N
  • C1=CC=C(C=C1)P(=C=P(C2=CC=CC=C2)(C3=CC=CC=C3)C4=CC=CC=C4)(C5=CC=CC=C5)C6=CC=CC=C6
Properties
C37H30P2
Molar mass 536.595 g·mol−1
Appearance yellow solid
Density 1.205 g/cm3
Melting point 198–201 °C (388–394 °F; 471–474 K)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Hexaphenylcarbodiphosphorane is the organophosphorus compound with the formula C(PPh3)2 (where Ph = C6H5). It is a yellow, moisture-sensitive solid. The compound is classified as an ylide and as such carries significant negative charge on carbon. It is isoelectronic with bis(triphenylphosphine)iminium. The P-C-P angle is 131°.[1] The compound has attracted attention as an unusual ligand in organometallic chemistry.[2]

Preparation

The compound was originally prepared by deprotonation of the phosphonium salt [HC(PPh3)2]Br using potassium.[3]

An improved procedure entails production of the same double phosphonium salt from methylene bromide. The double deprotonation is effected with potassium amide.[4]

Related compounds

References

  1. ^ "Carbodiphosphoranes: The Chemistry of Divalent Carbon(0)". Angewandte Chemie International Edition. 45 (47): 8038–8042. 2006. doi:10.1002/anie.200602552. PMID 17075933. {{cite journal}}: Cite uses deprecated parameter |authors= (help)
  2. ^ Carbodiphosphoranes and Related Ligands. Topics in Organometallic Chemistry. Vol. 30. 2010. pp. 49–92. Bibcode:2010tmcn.book...49P. doi:10.1007/978-3-642-04722-0_3. ISBN 978-3-642-04721-3. {{cite book}}: |journal= ignored (help); Cite uses deprecated parameter |authors= (help)
  3. ^ "Hexaphenylcarbodiphosphorane, (C6H5)3P:C:P(C6H5)3". Journal of the American Chemical Society. 83 (16): 3539–40. 1961. doi:10.1021/ja01477a052. {{cite journal}}: Cite uses deprecated parameter |authors= (help)
  4. ^ Gruber, Marco; Bauer, Walter; Maid, Harald; Schöll, Kilian; Tykwinski, Rik R. (2017). "Synthetic and NMR Studies on Hexaphenylcarbodiphosphorane (Ph3P=C=PPh3)". Inorganica Chimica Acta. 468: 152–158. doi:10.1016/j.ica.2017.04.018.