| abstract |
A process for dyeing keratin-containing fibers, in particular human hair, is claimed, in which DOLLAR A (A) 2-oxocarboxylic acid derivatives having the formula (I) DOLLAR F1 in which R · 1 · for a hydrogen atom, a C¶1¶-C¶ 4¶-alkyl group, a carboxyl radical, a carboxylate radical, an aryl, benzyl or heteroaryl group which is represented by one or more C¶1¶-C¶4¶-alkyl, C¶1¶-C¶4¶-alkoxy- , C¶1¶-C¶4¶-hydroxyalkoxy, hydroxy, carboxy, sulfo or nitro group (s) may be substituted, DOLLAR AX for O · - ·, OH, a C¶1¶-C¶4 ¶-alkoxy or an NR · 2 · R · 3 · group, in which R · 2 · and R · 3 · are identical or different and are hydrogen, C¶1¶-C¶4¶-alkyl or hydroxy-C ¶2¶-C¶4¶-alkyl, DOLLAR A where, if X is NR · 2 · R · 3 ·, the radicals R · 2 · and R · 3 · can also form a heterocyclic ring together with the nitrogen atom , DOLLAR A in combination with DOLLAR A (B) at least one compound with primary or secondary amino nogroup or hydroxyl group, selected from primary or secondary aliphatic or aromatic amines, nitrogen-containing heterocyclic compounds, from 2 to 9 amino acids and oligopeptides and aromatic hydroxy compounds, and / or at least one CH-active compound, DOLLAR A are applied to the fiber as a coloring component. |