Symmetric biaryls are commonly prepared by homocoupling of aryl halides. Nickel catalysts of this reaction are especially attractive due to their availability, ease in handling, and tolerance toward many functional groups. Nowadays many procedures of homocoupling were developed utilizing nickel [1, 2], but the most general was the method first introduced in [3]. In this method NiCl2 (PPh3) 2 is used where Ni (II) is reduced to Ni (0) with the help of ...
