Analysis of the Synergistic Effect of Carbonylplatinum Complexes on the Iridium-Catalysed Carbonylation of Methanol to Acetic Acid

摘要

High-pressure NMR mechanistic investigations into the promoting role of dicarbonyldiiodoplatinum complex in the irid-ium-catalysed Carbonylation of methanol to acetic acid are consistent with iodide abstraction from the [IrI_3(CH_3)(CO)_2]~-resting state species by [PtI_2(CO)_2I,unbolting the rate-limiting migratory CO insertion step.A new [Ir-Pt] heterodimetallic complex,which presumably represents the key species involved in the abstraction of I~-,has been characterised by NMR in tandem with FAB-MS.