Primary intermediates for hair coloring compositions for oxidative dyeing of hair are compounds of the formula (1):
1
where R
1
, and R
2
are each individually selected from a hydrogen atom, a C
1
to C
3
alkyl group, a C
1
to C
5
mono or dihydroxyalkyl group; phenyl or benzyl optionally substituted with an alkoxy group, or R
1
and R
2
together with the nitrogen atom to which they are attached form a piperazine, piperidine, imidazole, or morpholine ring.
用于氧化染发的染发组合物的主要中间体是式 (1) 的化合物: 1 其中 R 1 和 R 2 分别选自氢原子、C 1 至 C 3 烷基、C 1 至 C 5 单羟基或二羟基烷基、任选被烷氧基取代的苯基或苄基,或 R 1 和 R 2 与它们连接的氮原子一起形成
哌嗪、
哌啶、
咪唑或吗啉环。