Improved synthesis of 4,4′-diamino-2,2′-bipyridine from 4,4′-dinitro-2,2′-bipyridine-N,N′-dioxide

A superior synthetic route to 4,4′-diamino-2,2′-bipyridine has been developed. This procedure compares favorably with existing methods, producing 4 times the yield previously reported. In addition, mild reaction conditions are utilized, allowing a considerably more efficient production, and subsequent purification, of the diamino complex.