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DOI: 10.1039/A808971J (Paper) Reference Section for: J. Chem. Soc., Dalton Trans., 1999, 831-834

Reaction of tris[(diphenylphosphino)dimethylsilyl]methane with molybdenum hexacarbonyl and deprotonation to give a salt with a planar carbanion. Crystal structures of (Ph2PMe2Si)3CH and [Li(tmen)2][C(SiMe2PPh2)3], tmen = N,N,N[hair space]′,N[hair space]′-tetramethylethane-1,2-diamine

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Anthony G. Avent, Dominique Bonafoux, Colin Eaborn, Sushil K. Gupta, Peter B. Hitchcock and J. David Smith

Abstract

The compound (Ph2PMe2Si)3CH I reacted (i) with [Mo(CO)6] to give cis-[Mo(CO)4{(Ph2PMe2Si)3CH}] 1 in which two phosphine groups are co-ordinated to molybdenum and one is free, and (ii) with LiBu in the presence of N,N,N′,N′-tetramethylethane-1,2-diamine (tmen) to give [Li(tmen)2][C(SiMe2PPh2)3] 2, which contains discrete planar carbanions and no Li–P co-ordination. The crystal structures of compounds I and 2 have been determined and 1 has been characterised spectroscopically.

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