Abstract
The mechanism of reaction of trans-PdAr 2L 2 (Ar = m-tolyl or phenyl, L = Pet 2Ph) 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)L 2. 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.
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