| 摘要 |
<p>A ruthenium-phosphine complex represented by formula (I): <CHEM> wherein R represents a hydrogen atom, a methyl group, or a methoxy group; S represents a tertiary amine; (i) when y is 0, then x is 2, z is 4, and p is 1; and (ii) when y is 1, then x is 1, z is 1, and p is 0. The complex is prepared by reacting 1 mol of (Ru Cl2 cyclooctadiene)n and a 2,2'-bis(diarylphosphino)-6,6'-dimethylbiphenyl in a solvent in the presence of 4 mols of a tertiary amine, e.g. triethylamine. If 1.2 mols of the biphenyl is used in an inert solvent, e.g. benzene, the product type (i) is formed. 2 mols of biphenyl and a reducing solvent, e.g. a lower alkanol, give a type (ii) product. 15 specific complexes are shown of which 12 are type (i). The complexes are inexpensive and have excellent performance as a catalyst for various organic syntheses, and particularly asymmetric hydrogenation in the liquid phrase, e.g. of a dehydroamino acid.</p> |
