Patent: Metal-Catalyzed Arylations of Hydrazines, Hydrazones, and Related Substrates. 21Patent Authors: Buchwald, S.L.; Wagaq, S.; Geis, O.U.S. Patent No. 6,465,693Date Issued: October 15, 2002Patent Title: Metal-Catalyzed Arylations of Hydrazines, Hydrazones, and Related Substrates.