摘要:
The mechanism of hydroesterification of styrene using in situ-formed Pd(OTs)(2)(PPh3)(2) from Pd(OAc)(2), PPh3 and TsOH in methanol has been investigated by isolation and characterisation of catalytically active intermediates. From reaction mixtures, Pd-hydridocarbonyl and Pd-acyl complexes were isolated and characterised, based on which a Pd hydride mechanism has been proposed. Formation of palladium hydride species has also been confirmed by P-31-NMR experiments. (C) 2000 Elsevier Science S.A. All rights reserved.