Abstract

Abstract The reaction of 2 equiv of the optically active P, N bidentate ligands 1–3 with RuCl(PPh 3 ) 3 gives the RuCl 2 (1–3) 2 (4–6) complexes in good yield as a mixture of isomers. The solid state structure of RuCl 2 ( 2 ) 2 (5c) is described: the two chlorine atoms are in trans position and due to steric crowding, one of the two ligands 2 is more weakly bound to Ru. The complexes 4–6 show moderate to good catalytic activity for the hydrogenation of acetophenone in basic media in hydrogen transfer conditions, from propanol-2, or under dihydrogen, but the enantiomeric excesses are low.

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