Mechanism of reaction of trans-diarylbis(diethylphenylphosphine)palladium(II) complexes with aryl iodides to give biaryls

Article abstract of DOI:10.1016/0022-328X(87)80292-9

The mechanism of reaction of trans-PdAr2L2 (Ar = m-tolyl or phenyl, L = PEt2Ph) with aryl iodides affording biaryls has been studied.The rate of reaction is independent of the concentration of aryl iodide but is significantly accelerated by the presence of trans-PdAr(I)L2.Cross-over experiments on the reaction of diarylpalladium complexes with monoarylpalladium iodides reveals the occurrence of two types of intermolecular processes between the diaryl and monoaryl complexes.The first process results in a scrambling of aryl groups between the diaryl and monoaryl complexes without formation of biaryls, while the second yields the reductive elimination products, biaryls.