Patent ID: 8609846

Claim:
A compound of the formula Ia or Ib in which R are identical or different aryloxy, arylthio, hetaryloxy or hetarylthio radicals, n is 0, 1, 2, 3, 4 or 5, B is C 1 -C 6 -alkylene or 1,4-phenylene, where the phenylene radical may be mono- or polysubstituted by alkyl, nitro, cyano and/or halogen, A is —COOM, —SO 3 M or —PO 3 M, M is hydrogen, an alkali metal cation or [NR′] 4 + , R′ is hydrogen or alkyl, where the R′ radicals may be the same or different, L is a bridge of the formula —Ar—, —Ar—Ar— or —Ar—Ar—Ar— which may be mono- or polysubstituted by phenyl, alkyl, alkoxy, alkylthio and/or —NR 4 R 5 , and in which Ar is aryl or hetaryl which may be fused to saturated or unsaturated 5- to 18-membered rings which may comprise heteroatoms which may be the same or different in the case of two or three Ar, R 4 , R 5 are each independently hydrogen, alkyl whose carbon chain may be interrupted by one or more —O—, —S—, —CO—, —SO— and/or —SO 2 — moieties, aryl or hetaryl, each of which may be mono- or polysubstituted by alkyl, alkoxy and/or alkylthio, R 1 , R 2 are each independently radicals of the formula IIa or IIb R 3 is phenyl, alkyl, alkoxy, alkylthio or —NR 7 R 8 , m is 0, 1, 2, 3 or 4, X is C(R 6 R 7 ) 2 , NR 8 , oxygen or sulfur and R 6 , R 7 , R 8 are each independently hydrogen, alkyl whose carbon chain may be interrupted by one or more —O—, —S—, —CO—, —SO— and/or —SO 2 — moieties, aryl or hetaryl, each of which may be mono- or polysubstituted by alkyl, alkoxy and/or alkylthio.