| 摘要 |
ÄProblemÜ It is to provide novel ruthenium complexes having an optically active diphosphine compound, which has asymmetry on carbon and is easy to synthesize, as the ligand and a process for preparing optically active alcoholic compounds using said complexes as the catalysts, wherein said process is the process for preparing optically active alcoholic compounds, which are excellent in terms of reactivity, enatioselectivity and the like in an asymmetric hydrogenation of carbonyl compounds compared with conventional ruthenium complex catalysts having an optically active diphosphine compound having the axial chirality or the asymmetry on carbon as the ligand. <??>ÄSolutionÜ An optically active ruthenium complex represented by the general formula (1) <CHEM> (wherein X and Y, which can be identical to or different from each other, represent a hydrogen atom or an anion group, R<1> and R<2>, which can be identical to or different from each other, represent a chain or cyclic hydrocarbon group of carbon number 1 to 20, which can be substituted, R<3> and R<4>, which can be identical to or different from each other, represent a hydrogen atom or a hydrocarbon group of carbon number 1 to 3, and R<5>, R<6>, R<7> and R<8>, which can be identical to or different from one another, represent a hydrocarbon group of carbon number 1 to 30, which can be substituted, with the proviso that when X and Y are bromine, R<1> and R<2> are a methyl group, and when R<3> and R<4> are a hydrogen atom, at least one of R<5>, R<6>, R<7> and R<8> is not a phenyl group.).
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