| abstract |
Disclosed is a method of dyeing keratin-containing fibers comprising treating the fiber with at least one compound of formula (1), wherein R1, R2, R3, R4 independently from each other are hydrogen; hydroxy; -S-H; -S-C1-C12alkyl; halogen; C1-C12alkyl or C1-C12alkoxy, which may be substituted by one or more C1- C5alkyl, C1-C5-alkoxy, hydroxy, -(CO)-H or -(CO)-C1-C5alkyl; -NR5R6; -NO2; -(CO)H or (CO)-C1-C5alkyl; C6-C12aryl, C6-C12aryl-C1-C4alkyl or C6-C12aryl-C1-C4alkoxy, wherein the aryl moiety may be substituted by one or more C1-C5alkyl, C1-C5alkoxy, -(CO)-H or -(CO)-C1-C5alkyl; R5 and R6 independently from each other are hydrogen; hydroxy; C1-C12alkyl; hydroxy-C1- C12alkyl; -(CO)-H; -(CO)-C1-C5alkyl; phenyl or phenyl-C1-C5alkyl, wherein the phenyl moiety may be substituted by one or more C1-C5alkyl, C1-C5alkoxy, halogen, -NH2, mono-C1-C5alkylamino, di-C1-C5alkylamino, -NO2, carboxy or hydroxy; and An is an anion. Furthermore, the present invention relates to novel heterocyclic compounds, compositions thereof, especially comprising other dyes, and to processes for their preparation and application to hair dying. |