Patent ID: 6977312

Claim:
A compound of formula I where A 1 and A 2 are each, independently of one another, B, N, P or CR 5 , where R 5 is hydrogen, alkyl, cycloalkyl, aryl or heteroaryl, or R 5 is a polymeric support which is optionally bound via a spacer group, X is O, S, NR a , where R a is hydrogen, alkyl, cycloalkyl or aryl, or is a C 1 -C 10 -alkylene bridge which optionally meets one or more of the following requirements (a) to (d): (a) the bridge has one, two, three or four double bonds, (b) the bridge carries one, two, three or four substituents selected from a group consisting of: alkyl, alkoxy, halogen, nitro, cyano, carboxyl, carboxylate, cycloalkyl and aryl, where the aryl substituent is optionally substituted by one, two or three substituents selected from a group consisting of alkyl, alkoxy, halogen, SO 3 H, sulfonate, NE 1 E 2 , alkylene-NE 1 E 2 , trifluoromethyl, nitro, alkoxycarbonyl and cyano, (c) the bridge is interrupted by one, two or three nonadjacent, substituted or unsubstituted heteroatoms, (d) the bridge is fused with one, two or three rings selected from a group consisting of aryl and heteroaryl rings, where the fused-on rings optionally carry one, two or three substituents selected from a group consisting of: alkyl, cycloalkyl, aryl, alkoxy, cycloalkoxy, aryloxy, acyl, halogen, SO 3 H, sulfonate, trifluoromethyl, nitro, cyano, carboxyl, alkoxycarbonyl, NE 1 E 2 and alkylene-NE 1 E 2 , Y 1 and Y 2 each represents, independently of one another, a group containing one atom selected from the group consisting of phosphorus, arsenic and antimony, which atom is bound directly or via an oxygen atom to the phenyl ring in formula I, R 1 , R 2 , R 3 and R 4 are each, independently of one another, hydrogen, alkyl, cycloalkyl, aryl, alkoxy, halogen, NE 1 E 2 , alkylene-NE 1 E 2 , trifluoromethyl, nitro, alkoxycarbonyl or cyano, and E 1 and E 2 are identical or different and each represents alkyl, cycloalkyl or aryl.