Patent ID: 7589196

Claim:
A compound of the formula I, where X 1 and X 2 are each, independently of one another, secondary phosphino; R 1 and R 2 are each, independently of one another, hydrogen, C 1 -C 8 -alkyl, C 3 -C 8 -cycloalkyl, C 3 -C 8 -cycloalkyl-C 1 -C 4 -alkyl, C 6 -C 10 -aryl or C 7 -C 11 -aralkyl, or R 1 and R 2 together are C 4 -C 8 -alkylene, 3-oxapentyl-1,5-ene, —(CH 2 ) 2 —NH—(CH 2 ) 2 — or —(CH 2 ) 2 —N(C 1 -C 4 alkyl)-(CH 2 ) 2 —, R 3 is hydrogen, C 1 -C 8 -alkyl, C 3 -C 8 -cycloalkyl, C 3 -C 8 -cycloalkyl-C 1 -C 4 -alkyl, C 6 -C 10 -aryl or C 7 -C 11 -aralkyl, or R 1 is as defined above and R 2 and R 3 together are C 2 -C 8 -alkylidene, C 4 -C 8 -cycloalkylidene, C 1 -C 4 -alkylene, C 2 -C 8 -alk-1,2-enyl, —C(O)— or a group of the formula or R 1 R 2 N and R 3 O together are a group of the formula R 4 and R 7 are each, independently of one another, hydrogen, C 1 -C 4 -alkyl, C 1 -C 4 -alkoxy, F, Cl or trifluoromethyl, R 5 is hydrogen, R 4 or an R 3 O— group, where R 3 O— groups in the two rings can be identical or different, R 6 is hydrogen, R 7 or an R 1 R 2 N— group, where R 1 R 2 N— groups in the two rings can be identical or different, R 5 and R 6 together are trimethylene, tetramethylene or —CH═CH—CH═CH—, and R 11 is C 1 -C 8 -alkyl, C 3 -C 8 -cycloalkyl, C 3 -C 8 -cycloalkyl-C 1 -C 4 -alkyl, C 6 -C 10 -aryl or C 7 -C 11 -aralkyl, where R 1 , R 2 , R 3 , R 4 and R 7 are unsubstituted or substituted by C 1 -C 4 -alkyl, C 1 -C 4 -alkoxy, OH, F, Cl, Br, trifluoromethyl, C 1 -C 4 -hydroxyalkyl, —COOH, —SO 3 H, —C(O)O—C 1 -C 4 -alkyl, —SO 3 —C 1 -C 4 -alkyl, —C(O)—NH 2 , —CONHC 1 -C 4 -alkyl, —CON(C 1 -C 4 -alkyl) 2 , —SO 3 —NH 2 , —SO 2 —NHC 1 -C 4 -alkyl, —SO 3 —N(C 1 -C 4 -alkyl) 2 , —O 2 C—R 8 , —O 3 S—R 8 , —NH—(O)C—R 8 , —NH—O 3 S—R 8 , —NH 2 , —NHR 9 or —NR 9 R 10 , where R 8 is hydrogen, C 1 -C 8 -alkyl, C 3 -C 8 -cycloalkyl, C 3 -C 8 -cycloalkyl-C 1 -C 4 -alkyl, C 6 -C 10 -aryl or C 7 -C 11 -aralkyl, and R 9 and R 10 are each, independently of one another, C 1 -C 4 -alkyl, phenyl or benzyl or R 9 and R 10 together are tetramethylene, pentamethylene, 3-oxa-1,5-pentane or —(CH 2 ) 2 —N(C 1 -C 4 -alkyl)-(CH 2 ) 2 —.