The formation of vinylidene molybdenum complexes and their transformation into mononuclear carbyne complexes; X-ray crystal structure of [Mo{CCHPh}Br{P(OMe)3}2(η-C5H5)]

Abstract

Reaction of [Mo(PhC₂Br){P(OMe)₃}₂(η-C₅H₅)][BF₄] with K[BHBu₃^s] or Li₂Cu₂Me₄ gives respectively [Mo{CCHPh}Br{P(OMe)₃}₂(η-C₅H₅)] and [MoC·CMe₂Ph{P(OMe)₃}₂(η-C₅H₅)]; the bromovinylidene react with K[BHBu₃^s] to give [MoC·CH₂Ph{P(OMe)₃}₂(η-C₅H₅)] in good yield and with HBF₄–Et₂O to give [BrMoC·CH₂Ph{P(OMe)₃}₂(η-C₅H₅)][BF₄], which is reduced by Na–Hg to [MoC·CH₂Ph{P(OMe)₃}₂-(η-C₅H₅)].