Patent ID: 7081544

Claim:
A chiral ligand having the formula I wherein in formula I R 1 represents an ethyl, isopropyl, tert-butyl, (C 1 –C 12 )-alkylaryl, (C 1 –C 12 )-alkyl-O-aryl, alkenyl, heteroaromatic aryl, O-alkyl, O-aryl, NH-alkyl, or N-(alkyl) 2 , wherein the two alkyl radicals can also be linked together directly or via an oxygen bridge, O-(aryl), NH-(aryl), or N-(alkyl)(aryl) radical, R 2 to R 9 mutually independently have the meaning of R 1 or stand for a radical selected from the group consisting of O—CO-alkyl, O—CO-aryl, F, Cl, Br, OH, NO 2 , Si(alkyl) 3 , CF 3 , CN, CO 2 H, COH, SO 3 H, CONH 2 , CONH(alkyl), CON(alkyl) 2 , SO 2 (alkyl), SO(alkyl), SO(aryl), SO 2 (aryl), SO 3 (alkyl), SO 3 (aryl), S-alkyl, S-aryl, NH—CO(alkyl), CO 2 (alkyl), CONH 2 , CO(alkyl), NHCOH, NHCO 2 (alkyl), CO(aryl), CO 2 (aryl), CH═CH—CO 2 (alkyl), CH═CH—CO 2 H, PO(aryl) 2 , PO(alkyl) 2 , PO 3 H, PO(O-alkyl) 2 and aryl, wherein in each case two or more adjacent radicals can mutually independently also be linked together to form a condensed ring system, and wherein in R 1 to R 9 alkyl stands for a hydrocarbon radical with 1 to 12 C atoms and alkenyl for a monounsaturated or polyunsaturated hydrocarbon radical with 2 to 4 C atoms, each of which can be linear or branched and can be substituted with Cl, F, alkyl (C 1 –C 12 ), O-alkyl (C 1 –C 12 ), (C 5 –C 10 ) aryl, O—(C 5 –C 10 ) aryl, NH 2 , NH(alkyl (C 1 –C 12 )), N(alkyl (C 1 –C 12 )) 2 , and aryl stands for a five- to ten-membered aromatic radical, which can be substituted with Cl, F, Br, alkyl (C 1 –C 12 ), O-alkyl (C 1 –C 12 ), (C 5 –C 10 ) aryl, O—(C 5 –C 10 ) aryl, NH 2 , NH(alkyl (C 1 –C 12 )), N(alkyl (C 1 –C 12 )) 2 , wherein one to four carbon atoms in the aromatic radical can also be replaced by heteroatoms selected from the group consisting of nitrogen, oxygen and sulfur to form a five- to ten-membered heteroaromatic aryl radical.