申请人:——
公开号:US05676706A1
公开(公告)日:1997-10-14
Compounds of the formula (I) and their salts with inorganic and organic acids, ##STR1## in which R.sub.1 is a hydrogen atom or a trimethylsilyl group, R.sub.2, R.sub.3, R.sub.4, and R.sub.5 are, independently of each other, a hydrogen atom, a (C.sub.1 -C.sub.4) alkyl group, a hydroxy-(C.sub.2 -C.sub.3) alkyl group, an alkoxy-(C.sub.2 -C.sub.3) group, an amino-(C.sub.2 -C.sub.3) group, or a 2,3-dihydroxypropyl group, and in which R.sub.1, R.sub.2, R.sub.3, R.sub.4 and R.sub.5 are not simultaneously hydrogen atoms, and processes for their preparation and use as hair-coloring agents.
式(I)及其与无机和有机酸盐的化合物,其中R.sub.1是氢原子或三甲基硅基,R.sub.2、R.sub.3、R.sub.4和R.sub.5分别是氢原子、(C.sub.1-C.sub.4)烷基、羟基-(C.sub.2-C.sub.3)烷基、烷氧基-(C.sub.2-C.sub.3)基团、氨基-(C.sub.2-C.sub.3)基团或2,3-二羟基丙基基团,且其中R.sub.1、R.sub.2、R.sub.3、R.sub.4和R.sub.5不同时为氢原子,以及它们的制备和用作染发剂的方法。