| 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 is a radical of formula II represents, wherein R₁₂ represents a partially or completely fluorine-substituted C₁-C₅ alkyl; R₁₃ is C₁-C₄ alkyl, C₁-C₄ alkoxy, -SiR₄R₅R₆, halogen, -SO₃M, -CO₂M, -PO₃M, -NR₇R₈ or - [ ⊕ NR₇R₈R₉] X ⊖ ; m is a number from 1 to 3, n is 0 or a number from 1 to 4 and the sum of m + n is 1 to 5; R₃, R₁₀, R₁₁ independently of one another have the same meaning as R₂ or independently of one another C₁-C₁₂-alkyl, C₅-C₁₂-cycloalkyl, phenyl, with C₁-C₄-alkyl or C₁-C₄-alkoxy substituted C₅-C₁₂-cycloalkyl or with one to three C₁-C₄ alkyl, C₁-C₄ alkoxy, -SiR₄R₅R₆, halogen, -SO₃M, -CO₂M, -PO₃M, -NR₇R₈ or - [ ⊕ NR₇R₈R₉] X ⊖ represent substituted phenyl; R₄, R₅ and R₆ are independently C₁-C₁₂ alkyl or phenyl; R₇ and R₈ are H, C₁-C₁₂ alkyl, phenyl or R₇ and R₈ together represent tetramethylene, pentamethylene or 3-oxa-1,5-pentylene; R₉ denotes H or C₁-C₄ alkyl, M represents H or an alkali metal, X ⊖ is the anion of a monobasic acid, and * denotes a stereogenic C atom, in the form of its 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. |