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A series of symmetrical biaryls was synthesized from arylmercuric chlorides and biarylmercurials in the presence of [ClRh(CO)2]2 in hexamethylphosphoramide(HMPA). The mechanism of the [ClRh(CO)2]2 catalyzed dimerization of biarylmercurials was studied, and shown to be mainly intermolecular reaction.