Stepwise transformation of a terminally bound alkylidyne ligand to a bridging acyl group at a bimetal centre via an asymmetrically bridging alkyl; X-ray crystal structures of [N(PPh3)2][ReW(µ-CHR)(CO)9](R = C6H4Me-4), [ReW(µ-CH2R)(µ-Me2PCH2PMe2)(CO)7], and [ReW(µ-OCCH2R)(µ-Ph2PCH2PPh2)(CO)6{P(OMe)3}]

Abstract

Rhenium–tungsten complexes containing bridging alkylidene, asymmetrically bridging alkyl, and bridging acyl ligands have been synthesized sequentially from the terminal alkylidyne complex [ReW(CR)(CO)₉](R C₆H₄Me-4), and the structures of the complexes [N(PPh₃)₂][ReW(µ-CHR)(CO)₉], [ReW(µ-CH₂R)(µ-Me₂PCH₂PMe₂)(CO)₇] and [ReW(µ-OCCH₂R)(µ-Ph₂PCH₂PPh₂)(CO)₆{P(OMe)₃}] have been established by X-ray crystallography.