Palladium-catalyzed reductive homocoupling of N′-tosyl arylhydrazines

A novel procedure for the preparation of biaryl compounds by Pd-catalyzed homocoupling of N′-tosyl arylhydrazine has been described. N′-Tosyl arylhydrazine, as a readily available and stable coupling partner, demonstrated its generality in the homocoupling reactions. The scope of the reaction and possible mechanism have also been investigated.