New dimethyl derivatives of 3-nitro-4-aminoaniline, process for their preparation, and their use for dyeing keratinic fibres. The invention relates to dimethyl derivatives of 3-nitro-4-aminoaniline of formula: ##STR1## in which CH.sub.3 is in position 2 or 5 of the benzene ring and R.sub.1 and R.sub.2 denote independently of each other a hydrogen atom, a lower alkyl group, a lower mono- or polyhydroxyalkyl or a lower aminoalkyl group in which the amino group is optionally mono- or disubstituted by a lower alkyl radical or by a lower mono- or polyhydroxyalkyl radical, it being understood that the two symbols R.sub.1 and R.sub.2 can be simultaneously other than hydrogen only when the mobile CH.sub.3 radical is in position 5, or cosmetically acceptable salts of these compounds, as well as the process for preparing them and their use in dye compositions, in particular for hair, equally for direct coloring and for coloring by an oxidation route.
3-硝基-4-
氨基
苯胺的新二甲基衍
生物,它们的制备方法,以及它们在染色角蛋白纤维中的用途。该发明涉及
3-硝基-4-
氨基
苯胺的二甲基衍
生物,其
化学式为:##STR1## 其中CH.sub.3位于苯环的2或5位,R.sub.1和R.sub.2独立地表示氢原子、低碳基团、低
单糖或
多糖基团或低
氨基碳基团,其中
氨基团可以选择性地由低碳基团或低
单糖或
多糖基团单取代或双取代,理解R.sub.1和R.sub.2这两个符号只有在移动的CH.sub.3基团位于位置5时才能同时不是氢,或这些化合物的化妆品可接受的盐,以及制备它们的方法和它们在
染料组合物中的使用,特别是用于头发的直接染色和氧化法染色。