1241944-69-3Relevant academic research and scientific papers
Novel neutral phosphinite bridged dinuclear ruthenium(II) arene complexes and their catalytic use in transfer hydrogenation of aromatic ketones: X-ray structure of a new Schiff base, N3,N3′-di-2-hydroxybenzylidene-[2,2′]bipyridinyl-3,3′-diamine
Aydemir, Murat,Durap, Feyyaz,Baysal, Akin,Meric, Nermin,Bulda?, Ay?egül,Gümgüm, Bahattin,?zkar, Saim,Yildirim, Leyla Tatar
, p. 75 - 81 (2010)
A novel Schiff base N3,N3′-di-2-hydroxybenzylidene-[2,2′]bipyridinyl-3,3′-diamine, 1 was synthesized from condensation of salicylaldehyde with 3,3′-diamino-2,2′-bipyridine. Reaction of 1 with two equivalents of PPh2Cl in the presence of Et3N proceeds in toluene to give N3,N3′-di-2-(diphenylphosphino)benzylidene-[2,2′]bipyridinyl-3,3′-diamine, 2 in quantitative yield. Ruthenium(II) dimers [Ru(η6-arene)(μ-Cl)Cl]2 readily react with phosphinite ligand [(Ph2PO)2-C24H16N4], 2 in toluene at room temperature, to afford the neutral derivatives [C24H16N4{OPPh2-Ru(η6-arene)Cl2}2] {arene: benzene 3, p-cymene, 4}. All the complexes were fully characterized by analytical and spectroscopic methods. 31P-{1H} NMR, 1H-13C HETCOR or 1H-1H COSY correlation experiments were used to confirm the spectral assignments. Molecular structure of the Schiff base, 1 was also determined by X-ray single crystal diffraction study. The catalytic activity of complexes 3 and 4 in the transfer hydrogenation of acetophenone derivatives was tested. Stable ruthenium(II)-phosphinite complexes were found to be efficient catalysts in the transfer hydrogenation of aromatic ketones in excellent conversions up to 99% (up to 530 per hour) in the presence of iso-PrOH/KOH.
