| abstract |
PCT No. PCT/CH93/00025 Sec. 371 Date Sep. 27, 1993 Sec. 102(e) Date Sep. 27, 1993 PCT Filed Dec. 6, 1993 PCT Pub. No. WO93/15090 PCT Pub. Date Aug. 5, 1993.Novel racemic and optically active phosphorus compounds of the formula <IMAGE> I wherein R signifies hydroxy or a protected hydroxy group, R1 represents hydroxy, a protected hydroxy group or lower alkoxy and R2 represents lower alkyl, cycloalkyl, aryl or together with the phosphorus atom 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 parochial, allylic systems. |