Competitive dehydrogenative silylation and hydrogenative dimerization of vinyltriethoxysilane catalyzed by the [Ni(acac)2] + PPh3 system, intermediate and mechanistic implications

Article abstract of DOI:10.1016/0022-328X(96)06355-3

[Ni(acac)C₂H₅(PPh₃)] (C) has been shown to be an essential intermediate in the reaction between HSi(OC₂H₅)₃ and vinyltrisubstituted silanes catalyzed by the system [Ni(acac)₂] + PPh₃ at room temperature, but only after oxygenation of the coordinated triphenylphosphine. The stoichiometric and catalytic reactions of complex C with the substrates lead to catalysed, competitive dehydrogenative silylation and hydrogenative dimerization of vinylsilane, which occur following insertion of the latter into Ni-H, Ni-Si ≡ and Ni-C bonds.