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 But2C:NLi or But2C:NSiMe3 afford complexes of the type [(π-C5H5)M(CO)2N:CBu2t]. 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:CBu2t)], which with PPh3 gave [Ph3PBut][(π-C5H5)M(PPh3)l 2](M = Mo). PPh3 in monoglyme and CCl4 reacts with [(π-C5H5)Mo(CO)2N:CBu2t] to give [(π-C5H5)Mo(CO)-(PPh3)2H] and [Ph3PBut][(π-C5H5)MoCl4] respectively.