Patent ID: 7799096

Claim:
An agent for dyeing keratin-containing fibers, the agent comprising, in a cosmetic carrier: as a component A at least one compound according to formula I, in which: R 1 and R 2 mutually independently denote a (C 1 to C 6 ) alkyl group, a (C 2 to C 6 ) alkenyl group, a (C 1 to C 6 ) monohydroxyalkyl group, a (C 2 to C 6 ) polyhydroxyalkyl group, a (C 1 to C 6 )-alkoxy-(C 2 to C 6 )-alkyl group, an aryl-(C 1 to C 6 )-alkyl group or the two residues form together with the nitrogen atom a five-membered, six-membered, seven-membered or eight-membered heterocyclic ring, which is saturated or unsaturated, is optionally substituted and optionally contains at least one additional heteroatom selected from nitrogen, oxygen or sulfur; and R 3 and R 4 mutually independently denote a hydrogen atom, a halogen atom, a (C 1 to C 6 ) alkyl group, a (C 2 to C 6 ) alkenyl group, a hydroxy group, a (C 1 to C 6 ) alkoxy group, a (C 1 to C 6 ) monohydroxyalkyl group, a (C 2 to C 6 ) polyhydroxyalkyl group, a hydroxy-(C 1 to C 6 )-alkyloxy group, a piperidin-1-ylmethyl group, a pyrrolidin-1-ylmethyl group, a morpholin-4-ylmethyl group or a —(CH 2 ) n NR 5 R 6 group, in which R 5 and R 6 mutually independently denote a (C 1 to C 6 ) alkyl group or a (C 2 to C 6 ) monohydroxyalkyl group and n denotes an integer from 0 to 6; or R 3 and R 4 may form a five-membered or six-membered aromatic or heteroaromatic ring; and at least one CH-acidic compound as a component B.