摘要:
The lutetium hydride complex [CP*(2)Lu(mu -H)](2) (1) efficiently cleaves the Si-C bond of PhSiH(3) to produce benzene and cross-linked polysilanes (SiH(x))(y). The Si-C bond cleavage appears to proceed via the lutetium phenyl complex CP*(2)LuPh (2). This is supported by the reaction of PhSiH3 with 2, which results in the formation of benzene. Moreover, activation of the Si-C bond of C(6)F(5)SiH(3) by 1 yields the related lutetium aryl Complex CP*(2)LuC(6)F(5) (4) and oligosilanes. The reaction of 1 with o-MeOC(6)H(4)SiH(3), on the other hand, results in the formation of dihydrogen and the neutral lutetium silyl complex CP*(2)LuSiH(2)(o-MeOC(6)H(4)) (5). The solid-state structure of 5 was determined by X-ray crystallography, Reactions of arylsilanes with the lutetium methyl complex [CP*(2)LuMe](2) (3) are less selective than the corresponding reactions of 1 and lead to competitive Si-C and Si-H bond activations. Complex 1 acts as an efficient catalyst for organosilane hydrogenolysis. Thus, addition of excess phenyl- or hexylsilane to solutions of 1 under an atmosphere of dihydrogen at 75 degreesC results in formation of benzene or hexane, respectively, along with cross-linked polysilanes.