| abstract |
The use of ninhydrin derivatives of the following formula I or II is claimed for dyeing keratin-containing fibers, DOLLAR F1 in which DOLLAR AR · 1 · represents a phenyl or naphthyl radical which is substituted by halogen, C¶1¶-C¶4¶-alkyl , C¶1¶-C¶4¶-alkoxy, hydroxy, nitro, carboxy, sulfo-, mono- or di- (C¶1¶-C¶4¶) alkylamino can be substituted, the alkyl radicals together with the aromatic radicals can also form a fused heterocycle or a heterocycle with themselves, an optionally substituted pyridyl, pyrimidyl, quinolyl, pyrazolyl, imidazolyl, triazolyl, thiazolinyl or 1,3,4-thiadiazolyl radical, a carbamoyl , Thiacarbamoyl, ureido, (C¶1¶-C¶8¶) carboxyalkyl or guanidino group, DOLLAR AR · 2 ·, R · 3 · and R · 4 · represents a hydrogen atom, halogen atom, a C¶1 ¶-C¶4¶-alkyl- or C¶1¶-C¶4¶-alkoxy, hydroxy-, amino-, mono- or di- (C¶1¶-C¶4¶) -alkylamino group, whereby also two of the leftovers can form a condensed benzene ring. |