Reaction of tris [(diphenylphosphino) dimethylsiyl] methane with molybdenum hexacarbonyl and deprotonation to give a salt with a planar carbanion. Crystal structures of (Ph_2PMe_2Si)_3CH and [Li(tmen)_2][C(SiMe_2PPh_2)_3], tmen= N, N, N', N'-tetramet

摘要

The compound (Ph_2PMe_2Si)_3CH I reacted (i) with [Mo(CO)_6] to give cis-[Mo(CO)_4{(Ph_2PMe_2Si)_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(SiMe_2PPh_2)_3] 2, which contains discrete planar carbanions and no Li-P co-ordination. The crystal structures of compounds 1 and 2 have been determined and 1 has been characterised spectroscopically.