| abstract |
Compounds of the formula I, wherein R₁ is C₁-C₈-alkyl, phenyl or phenyl substituted with 1 to 3 C₁-C₄-alkyl or C₁-C₄-alkoxy; R₂ and R₃ independently of one another, for example C₁-C₁₂-alkyl, C₅-C₁₂-cycloalkyl, phenyl, C₅-C₁₂-alkoxy substituted with C₁-C₄-alkyl or C₁-Calkyl-alkoxy or with one to three C₁-C₄-alkyl, C₁-C₄ alkoxy or halogen, substituted phenyl; R₁₀ and R₁₁ are the same and for example C₁-C₁₂-alkyl, C₅-C₁₂-cycloalkyl, C₅-C₁-alkyl or C₁-C₄-alkoxy substituted C₅-C₁₂-cycloalkyl or with one to three C₁-C₄-alkyl, C₁ -C₄ alkoxy or halogen substituted phenyl; or R₁₀ and R₁₁ are different and, for example, C₁-C₁₂-alkyl, C₅-C₁₂-cycloalkyl, C₅-C₁-alkyl or C₁-C₄-alkoxy substituted C₅-C₁₂-cycloalkyl, phenyl or with one to three C₁-C₄- Alkyl, C₁-C₄-alkoxy or halogen substituted phenyl, and * denotes a stereogenic C atom, in the form of your racemates and diastereomers or mixtures of diastereomers.n n n Rhodium and iridium complexes with these ligands are suitable as homogeneous enantioselective catalysts for the hydrogenation of prochiral compounds with carbon or carbon / heteroatom double bonds. |