| 摘要 |
PCT No. PCT/CH93/00016 Sec. 371 Date Sep. 24, 1993 Sec. 102(e) Date Sep. 24, 1993 PCT Filed Jan. 22, 1993 PCT Pub. No. WO93/15089 PCT Pub. Date Aug. 5, 1993.Novel, racemic and optically active phosphorus compounds of the formula <IMAGE> I wherein R signifies lower alkyl, lower alkoxy, hydroxy or a protected hydroxy group, R1 and R2 are different from each other and represent lower alkyl, cycloalkyl, aryl, a five-membered heteroaromatic or a group of the formula <IMAGE> are described. The compounds of formula I are useful in the form of complexes with a metal of Group VIII as catalysts for asymmetric hydrogenations and for enantioselective hydrogen displacements in prochiral allylic systems.
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