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

Abstract

AbstractHigh‐pressure NMR mechanistic investigations into the promoting role of dicarbonyldiiodoplatinum complex in the iridium‐catalysed carbonylation of methanol to acetic acid are consistent with iodide abstraction from the [IrI3(CH3)(CO)2]– resting state species by [PtI2(CO)2], 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. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)