(η-Allyl)tris(trifluorophosphine)cobalt(I) complexes

Abstract

A series of complexes [CoL(PF₃)₃][I; L = 1–3-η-allyl, -(1-methylallyl), -(1,1-dimethylallyl), -(1,2-dimethylallyl), -(1,3-dimethylallyl), -cyclo-octenyl, and -cycloheptadienyl] has been prepared by low-pressure ligand-displacement reactions. ¹H and ¹⁹F N.m.r. studies indicate the absence of intermolecular phosphine exchange. The reactions of these complexes with hydrogen chloride and dihydrogen are discussed. The 1–3-η-(1,1-dimethylallyl) complex undergoes a novel thermal isomerisation to the anti-1,2-complex. The complex [Co(η-C₇H₉)(PF₃)₂] contains a 1–5-η-cycloheptadienyl group.