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.