| 摘要 |
Compounds of the formula I, <IMAGE> in which R1 is C1-C8-alkyl, phenyl or phenyl which is substituted by 1 to 3 C1-C4-alkyl or C1-C4-alkoxy; R2 and R3 are identical and are C1-C12-alkyl, C5-C12-cycloalkyl, C5-C12-cycloalkyl which is substituted by C1-C4-alkyl or C1-C4-alkoxy, or phenyl which is substituted by one to three C1-C4-alkyl, C1-C4-alkoxy, -SiR4R5R6, halogen, -SO 3M, -CO2M, -PO3M, -NR7R8 or -[<(+)>NR7R8R9]X<(-)>; or R2 and R3 are different and are C1-C12-alkyl, C5-C12-cycloalkyl, C5-C12-cycloalkyl which is substituted by C1-C4-alkyl or C1-C4-alkoxy, phenyl or phenyl which is substituted by one to three C1-C4-alkyl, C1-C4-alkoxy, -SiR4R5R6, halogen, - SO3M, -CO2M, -PO3M2, -NR7R8 or -[<(+)>NR7R8R9]X <# SDF#> ; R4, R5 and R6, independently of one another, are C1-C12-alkyl or phenyl, R7 and R8 are H, C1-C12-alkyl or phenyl, or R7 and R8 together are tetramethylene, pentamethylene or 3-oxa-1,5-pentylene, R9 is H or C1-C4-alkyl, M is H or an alkali metal, X<(-)> is the anion of a monobasic acid, and <*> is a stereogenic carbon atom, in the form of their racemates and diastereomers or mixtures of diastereomers. Rhodium and iridium complexes containing these ligands are suitable as homogeneous, enantioselective catalysts for the hydrogenation of prochiral compounds containing carbon-carbon or carbon-heteroatom double bonds. |
