197356-54-0Relevant academic research and scientific papers
Methods of dyeing keratin fibers with compositions containing pyrazolo-azole couplers
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, (2008/06/13)
The present invention relates to a composition for dyeing keratinous fibers, especially human hair, which in a medium appropriate for dyeing comprises: as coupler at least one compound of formula: ?in which: R1is especially hydrogen, alkyl, aryl, a heterocycle, a halogen, etc.; R2is especially hydrogen, halogen, aryloxy, alkoxy, acyloxy, arylthio, alkylthio, heteroarylthio, heteroaryloxy, etc.; Za, Zband Zcare independently a nitrogen atom or a carbon which carries a radical R3or R4whose meanings are identical to those of R1; at least one of Za, Zband Zcis a nitrogen atom; and R3and R4may together form an unsubstituted or substituted aromatic ring; and at least one oxidation base.
