Organonitrogen groups in metal carbonyl complexes. Part II. Di-t-butylmethyleneamino-derivatives of π-cyclopentadienyl-molybdenum and -tungsten carbonyl complexes.

Abstract

Reactions between [(π-C₅H₅)M(CO)₃Cl](M = Mo, W) and Bu^t₂C:NLi or Bu^t₂C:NSiMe₃ afford complexes of the type [(π-C₅H₅)M(CO)₂N:CBu₂^t]. In solution the molybdenum complex undergoes reversible i.r. and ¹H n.m.r. spectral changes with change in temperature. Interpretation is made in terms of conformational changes about the multiple metal–nitrogen bond. The complexes failed to react with pyridine, CS₂, SO₂, and CO, but iodine displaced CO to produce [(π-C₅H₅)M(CO)l₂(N:CBu₂^t)], which with PPh₃ gave [Ph₃PBu^t][(π-C₅H₅)M(PPh₃)l ₂](M = Mo). PPh₃ in monoglyme and CCl₄ reacts with [(π-C₅H₅)Mo(CO)₂N:CBu₂^t] to give [(π-C₅H₅)Mo(CO)-(PPh₃)₂H] and [Ph₃PBu^t][(π-C₅H₅)MoCl₄] respectively.