Patent: Metal-Catalyzed Arylations of Hydrazines, Hydrazones, and Related Substrates. 14Patent Authors: Buchwald, S.L.; Wagaw, S.; Geis, O.U.S. Patent No. 6,235,935Date Issued: May 22, 2001Patent Title: Metal-Catalyzed Arylations of Hydrazines, Hydrazones, and Related Substrates.