An Efficient High Yielding Approach for the Homocoupling of Aryl Boronic Acids

A concise, mild, and high yielding method yielding C2-symmetric biaryls is described. The addition of Cu(II) nitrate enhances the rate and the yield of the desired biaryl products. The conditions employed have yielded a number of substituted symmetric biaryls including 1,1′ and 2,2′ BINAP and are useful for the producing symmetric biaryls from their corresponding aryl boronic acids.