The chiral diiminodiphosphine ligand, [(R,R)-P2N2], has been prepared by the condensation of o-(diphenyl-phosphino)benzaldehyde and 1,2-diaminoeyclohexane. [(R,R)-P2N2] was reduced with excess NaBH4 in refluxing ethanol to afford the corresponding diaminodi-phosphine ligand [(R,R)-P2(NH)2]. The interaction of [(R,R)-P2(NH)2] with trans-RuCl2(DMSO)4 gave the chiral ruthenium complex [(R,R)-RuP2(NH)2] in 84% yield. The reaction of [(R,R)-RuP2(NH)2] with poly-(acrylic acid) using dieyclohexylcarbodiimine as the coupling agent, gave water soluble poly(acrylic acid salt)-supported chiral ruthenium complex [PAA-(R,R)-RuP2(NH)2]. These chiral ligands and ruthenium complexes have been fully characterized by microanalysis and IR, NMR spectroscopic methods. The polymer-bound ruthenium complex [PAA-(R,R)-RuP2(NH)2] as catalyst was used in asymmetric transfer hydrogenation of acetophenone in 2-propanol, producing the 1-phenyl-ethanol in 95% yield and 96% ee. The catalyst was reused twice with some loss of activity and enantioselec-tivity. Copyright