Reaction of Polysilacycloalkynes with CpCo(CO)₂ and CpMn(CO)₃

Abstract

Reactions of a pentasilacycloheptyne and a hexasilacyclooctyne with CpCo(CO)2 resulted in facile formation of metallapentene derivatives, and a tetrasilacyclohexyne gave a triene derivative. Photochemical reactions of CpMn(CO)3 with the tetrasilacyclohexyne and the hexasilacyclooctyne gave vinylidene complexes. The vinylidene complex readily reacts with tetrasilacyclohexyne to yield the triene and a bis(allene) derivative. The structures of one of the metallapentenes and of the bis(allene) were determined by X-ray crystallographic analysis.