摘要:
Complexes of general formula Ru(eta-4-1,3-diene)(eta-4-1,5-cyclooctadiene)(nitrile) are formed by reaction of various acyclic 1,3-dienes with Ru(eta-6-naphthalene)(eta-4-1,5-cyclooctadiene) (1) in the presence of nitriles. The coordinated nitrile is readily replaced by stronger pi-acceptors such as CO, (t)BuNC, P(OMe)3 and tertiary phosphines. In contrast, 1,3-cyclohexadiene reacts with 1 in the presence of benzonitrile to give Ru(1,3-C6H8)2(NCPh). The mono-protonated salt obtained from the 2,3-dimethylbutadiene complex Ru(eta-4-C6H10)(eta-4-1,5-C8H12)(PEt3) and HPF6 contains an agostic methyl group whose rotation is almost frozen at -90-degrees-C.