Abstract
Reactions of [π-C 5H 5(CO) 3M]Na (M = Cr, Mo, W) or [π-C 5H 5(CO) 2Fe]Na with the halodisilanes (CH 3) 5Si 2X or (CH 3) 4Si 2X 2 (X = Cl, Br) yield disilanyl complexes of the type L n MSi 2(CH 3) 5 or L n MSi 2(CH 3) 4X. AgBF 4 converts the chlorodisilanyl complexes into fluorinated derivatives (X = F). The chemical and spectroscopic properties of the new complexes are reported and compared with those of the corresponding monosilylated species. The interaction of pentamethyldisilanyl complexes with ylides results in a metal→carbanion transfer of the SiSi group through metal—silicon bond cleavage and transylidation. In the case of halodisilanyl compounds cleavage and transylidation is observed involving both the silicon—metal and silicon—halogen bond. These processes often occur simultaneously, but may also be verified in single steps.
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