A Base-Stabilized Silylimylidene Cation as a Ligand for Rhodium and Tungsten Complexes

The reaction of the base-stabilized silyliumylidene triflate [LSi(DMAP)]OTf (1 center dot OTf; L = PhC(NtBu)2, DMAP = 4-dimethylaminopyridine) with [Rh(cod)Cl](2) and W(CO)(5)THF afforded [{L(DMAP)Si}(2){mu-Rh(mu-Cl)(2)Rh(cod)}](OTf)(2) (2) and [L(DMAP)Si -> W(CO)(5)]OTf (3), respectively. Their crystal structures determined by X-ray crystallography show that the silyliumylidene cation acts as a two-electron donor coordinating to the rhodium and tungsten atoms.