Ferrocenyl ligands and the use thereof in catalysis

Bidentate organophosphorus ligand of the formula (I)

• wherein
• R, R′ independently of one another for each of the two substituents R and independently of one another for each of the two substituents R′ may denote a radical selected from the group C1–C24 alkyl, C2–C24 alkenyl, C3–C8 cycloalkyl, C3–C8 cycloalkenyl, C6–C14 aryl, phenyl, naphthyl, fluorenyl, furfuryl, 1-adamantyl, C2–C13 heteroaryl, in which the number of heteroatoms from the group N, O, S, may be 1 to 4, and in which the aforementioned substituents R and R′ may in each case be monosubstituted or polysubstituted, wherein these substituents may independently of one another be selected from the group C1–C12 alkyl, C2–C12 alkenyl, C1–C10 haloalkyl, C3–C8 cycloalkyl, C3–C8 cycloalkenyl, C2–C9 heteroalkyl, C1–C9 heteroalkenyl, C6–C14 aryl, phenyl, naphthyl, fluorenyl, C2–C7 heteroaryl, in which the number of heteroatoms from the group N, O, S, may be 1 to 4, C1–C10 alkoxy, C1–C9 trihalomethylalkyl, trifluoromethyl, trichloromethyl, fluoro, chloro, hydroxy, C1–C8 substituted amino of the forms mono-, di-, tri- C1–C8 alkylamino or C2–C8 alkenylamino or mono-, di-, tri- C6–C8 arylamino or carboxyl, carboxylato of the form COOR″″′ where R″″′ denotes a monovalent cation or a C1–C8 alkyl, C1–C8 acyloxy, tri- C1–C6 alkylsilyl, and in which two of these substituents may also be bridged, and wherein
• R″, R″′, R″″ independently of one another may for each of the substituents R″, R″′ or R″″ denote a radical selected from the group hydrogen, C1–C24 alkyl, C2–C24 alkenyl, C3–C8 cycloalkyl, C3–C8 cycloalkenyl, C1–C10 alkoxy, C1–C9 trihalomethylalkyl, trifluoromethyl, trichloromethyl, fluoro, chloro, hydroxy, C1–C8 substituted amino of the forms mono-, di-, tri- C1–C8 alkylamino or C2–C8 alkenylamino or mono-, di-, tri- C6–C8 arylamino or carboxyl, carboxylato of the form COOR″″′, where R″″′ denotes a monovalent cation or a C1–C8 alkyl or C1–C8 acyloxy, tri- C1–C6 alkylsilyl, and where two of these substituents may also be bridged.