Patent ID: 7132001

Claim:
An agent for coloring keratin fibers based on a developer-coupler combination, said agent containing, as the coupler, at least one 3-aminophenol derivative of formula (I), or a physiologically compatible salt thereof: wherein X 1 , X 2 , X 3 , and X 4 , independently of each other, denote sulfur, nitrogen, N—R1, oxygen, C—R2, C—R3, C—R4, or C—R5, provided that at least one and at the most three of the X 1 to X 4 groups denote nitrogen, N—R1, sulfur, or oxygen and, if at least two heteroatoms are present in the formula (I), at the most one of the X 1 to X 4 groups denotes sulfur, N—R1, or oxygen; R1 denotes hydrogen, a (C 1 –C 6 )-alkyl group, a phenyl group, a (C 2 –C 4 -hydroxy-alkyl group, or an acetyl group; R2, R3, R4, and R5, independently of each other, denote hydrogen, a halogen atom, a cyano group, a (C 1 –C 4 )-alkyl group, a (C 1 –C 4 )-alkoxy group, a (C 1 –C 4 )-alkyl thioether group, a marcapto group, a nitro group, an amino group, a (C 1 –C 4 )-alkylamino group, a di(C 1 –C 4 )-alkylamino group, a hydroxy-(C 2 –C 4 )-alkyl-amino group, a di[hydroxy-(C 2 –C 4 )-alkyl]-amino group, a [dihydroxy-(C 3 –C 4 )-alkyl]amino group, a trifluoromethyl group, an acetyl group, a trifluoroacetyl group, a formyl group, a trimethylsilyl group, a (C 1 –C 4 )-hydroxyalkyl group, or a (C 2 –C 4 )-dihydroxyalkyl group; or two adjacent R2 to R5 groups together with a remaining part of the formula (I) form an annelated heterocyclic or carbocyclic, substituted or unsubstituted ring.