Abstract
Kinetics of methanol carbonylation in acetophenone solvent catalyzed by an iridium complex in the presence of methyl iodide was found to be first order with respect to methanol, under reaction conditions of apparent zero order with respect to both carbon monoxide and methyl iodide, where carbon monoxide pressures higher than 15 kg/cm 2 and a CH 3I Ir ratio higher than 20 were adopted at 125–175 °C. Acetyl iridium (III) complexes were isolated from product solutions by stabilizing with triphenylphosphine. Both the observed kinetics and the formation of acetyl iridium(III) complexes are consistent with the rate-determining methanolysis of an acetyl iridium(III) species in the catalytic cycle.
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