Patent ID: 7009065

Claim:
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 C 1 –C 24 alkyl, C 2 –C 24 alkenyl, C 3 –C 8 cycloalkyl, C 3 –C 8 cycloalkenyl, C 6 –C 14 aryl, phenyl, naphthyl, fluorenyl, furfuryl, 1-adamantyl, C 2 –C 13 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 C 1 –C 12 alkyl, C 2 –C 12 alkenyl, C 1 –C 10 haloalkyl, C 3 –C 8 cycloalkyl, C 3 –C 8 cycloalkenyl, C 2 –C 9 heteroalkyl, C 1 –C 9 heteroalkenyl, C 6 –C 14 aryl, phenyl, naphthyl, fluorenyl, C 2 –C 7 heteroaryl, in which the number of heteroatoms from the group N, O, S, may be 1 to 4, C 1 –C 10 alkoxy, C 1 –C 9 trihalomethylalkyl, trifluoromethyl, trichloromethyl, fluoro, chloro, hydroxy, C 1 –C 8 substituted amino of the forms mono-, di-, tri- C 1 –C 8 alkylamino or C 2 –C 8 alkenylamino or mono-, di-, tri- C 6 –C 8 arylamino or carboxyl, carboxylato of the form COOR″″′ where R″″′ denotes a monovalent cation or a C 1 –C 8 alkyl, C 1 –C 8 acyloxy, tri- C 1 –C 6 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, C 1 –C 24 alkyl, C 2 –C 24 alkenyl, C 3 –C 8 cycloalkyl, C 3 –C 8 cycloalkenyl, C 1 –C 10 alkoxy, C 1–C 9 trihalomethylalkyl, trifluoromethyl, trichloromethyl, fluoro, chloro, hydroxy, C 1 –C 8 substituted amino of the forms mono-, di-, tri- C 1 –C 8 alkylamino or C 2 –C 8 alkenylamino or mono-, di-, tri- C 6 –C 8 arylamino or carboxyl, carboxylato of the form COOR″″′, where R″″′ denotes a monovalent cation or a C 1 –C 8 alkyl or C 1 –C 8 acyloxy, tri- C 1 –C 6 alkylsilyl, and where two of these substituents may also be bridged.