ORGANOMERCURATION OF THE CARBANION DERIVED FROM [M(CO)(4)(PH(2)PCH(2)PPH(2))] (M=CR, MO OR W) - CRYSTAL AND MOLECULAR-STRUCTURE OF [CR(CO)(4)(PH(2)PCH(HGME)PPH(2))]

The carbanions resulting from the deprotonation by (n)BuLi of compound s of the type [M(CO)(4)(Ph(2)PCH(2)PPh(2))] (M = Cr, Mo or W) are read ily organomercurated by RHgCl [R = e.g. Me, Et, Ph, or (C5H4)Fe(C5H5)] to give neutral complexes of the type [M(Co)(4){Ph(2)PCH(HgR)PPh(2)}] . The X-ray crystal structure of the complex with M = Cr and R = Me ha s been determined, and reveals intermolecular C-H ... O hydrogen bondi ng interactions to carbonyl oxygen acceptor atoms and a weak secondary intermolecular interaction between a carbonyl oxygen and the mercury atom.