SYNTHESIS OF TETRANUCLEAR RUTHENIUM (II) COMPLEX OF PYRIDYLOXY-SUBSTITUTED 2,2 '-DIOXYBIPHENYL-CYCLOTRIPHOSPHAZENE PLATFORM AND ITS CATALYTIC APPLICATION IN THE TRANSFER HYDROGENATION OF KETONES

Cyclophosphazene was reacted with biphenyl-2,2'- diol to afford the N3P3Cl4(O2C12H8) (1). Then, pyridyloxy cyclophosphazene, spiro N3P3(O2C12H8)(O-C5H4N-3)(4) (2) was synthesized from the reaction of 3-hydroxy pyridine and compound 1. The reaction of 2 with [RuCl2(p-cymene)](2) afforded Ru(II) complex (3). The structures of the ligand and complex are characterized by elemental analysis, FT-IR, H-1-, and P-31-NMR spectroscopy. Ru(II) complex has been employed as catalysts for the transfer hydrogenation of acetophenone in the presence of KOH using 2-propanol as a hydrogen source. The complex has demonstrated good catalytic activity in transfer hydrogenation of ketones.