Gold (I) and (III) catalyze Suzuki cross-coupling and homocoupling, respectively

Trinuclear triphenylphosphine 1,2Au(I) complexes with the [N,N,O]-tridentate unsymmetrical Schiff bases (1,2) catalyze the Suzuki cross-coupling reaction to afford nonsymmetrical biaryls in good yields, whereas the 1,2Au(III) complexes give only arylboronic homocoupling.