Stoichiometric Alkyne Metathesis at Metal Cluster Compounds: Interconversion of Os3W Alkyne–alkylidyne and Dimetallaallyl Clusters

[[abstract]]Treatment of Os3(CO)10(C2Me2) with CpW-(CO)2(=CTol) produced the alkylidyne-alkyne cluster CpWOs3(CO)10(mu3-CMe)(CMeCTol) (2) and the dimetalloallyl complex CpWOs3(CO)9[C(Me)C(Me)C(Tol)] (3) in sequence. Thermolysis of 3 induced the selective scission of one C-C bond to give a second alkylidyne-alkyne cluster, CpWOs3(CO)8(mu3-CTol)(C2Me2) (4), providing a model of alkyne metathesis through a dimetalloallyl intermediate.[[fileno]]2010311010056[[department]]化學