Reactions involving transition metals. Part VII. Oxidation–addition reactions of cyclo-octa-1,5-dieneiridium(I) complexes

Abstract

The complexes (cod)IrCIL (cod = cyclo-octa-1,5-diene, L = Ph₃P, Ph₃As, Ph₂MeP) undergo oxidative-addition and halide-exchange with HX (X = Cl, Br, I, CN) to give (cod)IrHX₂L, in which the hydride is trans to X. The complexes with L = pyridine or quinoline react differently, to give (cod)IrX₃py or (LH)[(cod)IrX₄](X = Cl, Br). Halogens convert the complexes (cod)IrCIL into (cod)IrX₃L (X = Cl, Br; L = Ph₃P, Ph₃As, py) or (quinH)[(cod)IrCl₄]. The last of these reacts with Ph₃P to give trans-(quinH)[(Ph₃P)₂IrCl₄]. The complexes are characterised by i.r. and n.m.r. spectroscopy.