A Highly Efficient Low Temperature Modification of the Classical Ullmann Reaction

The efficient synthesis of sterically demanding tetra-substituted biaryls by means of a one-pot threestep low-temperature modification of the classical Ullmann reaction is reported. The major benefit of this methodology lies in the ready synthesis of polybrominated biaryls, which can be subsequently functionalized into various target molecules by means of regioselective halogen/metal permutations.