Transfer hydrogenation of acetophenone catalyzed by in situ generated 2,6-bis(5-thioxo-4,5-dihydro-1,2,4-triazole-3-yl)pyridine-ruthenium(II) complexes

Abstract

2,6-Bis(5-thioxo-4,5-dihydro-1,2,4-triazole-3-yl)pyridines (3, 4) were used for the first time as ligand in ruthenium catalyzed transfer hydrogenation of acetophenone. The in situ prepared three-component system Ru(II)/tridentate triamine ligands (3a-3d, 4a-4d) and KOH catalysed the transfer hydrogenation reaction of acetophenone in good yields under mild conditions. © 2009 SIOC, CAS, Shanghai, & WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.