Mechanistic information of substitution reaction of W(PhC≡CPh)3(CO) with trimethylphosphine

Article abstract of DOI:10.1016/S0022-328X(97)00418-X

Substitution reaction of W(PhC≡CPh)₃(CO) (1) with PMe3 to give W(PhC≡CPh)₃(PMe₃) (2) has been studied by IR and NMR spectroscopy as well as cross-over experiments. A metastable intermediate W(CO)(PhC≡CPh)₂(PMe₃)₂ (3) is produced by adding two PMe₃ moieties into 1 accompanied with loss of a PhC≡CPh ligand. Subsequent conversion from 3 to 2 might involve decarbonylation and PMe₃/PhC≡CPh exchange.