| abstract |
Compounds of the formula (I) or (I'), where R1 is a hydrogen atom or C1-C4-alkyl and R'1 is C1-C4-alkyl; X1 and X2 are each, indepen~dently of one another, a secondary phosphine group; R2 is hydrogen, R01R02R03Si-, C1-C18 -acyl substituted by halogen, hydroxy, C1-C8-alkoxy or R04R05N-,-or R06-X01-C(O)-; R01, R02 and R03 are each, independently of one another, C1-C12-alkyl, unsubstituted or C1-C4-alkyl~or C1-C4-alkoxy-substituted C6-C10-aryl or C7-C12-aralkyl; R04and R05 are each, indepen~dently of one another, hydrogen, C1-C12-alkyl, C3-C8-cycloalkyl, C6-C10-aryl or C7-C12-aralkyl, or R04 and R05 together are trimethylene, tetramethylene, pentamethylene or 3-oxapentyle~ne; R06 is C1-C18-alkyl, unsubstituted or C1-C4-alkyl- or C1-C4-alkoxy-substituted C3-C8-cyclo~alkyl, C6-C10-aryl or C7-C12-aralkyl; X01 is -O- or -NH-; T is C6-C20-arylene; v is 0 or an integer from 1 to 4; and * denotes a mixture of racemic or enantiomerically pure diastereomers or pure racemic or enantiomerically diastereomers, are excellent chiral ligands for metal com~plexes as enantioselective catalysts for the hydrogenation of prochiral organic compounds. |