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
式中 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;可选择被烷氧基取代的苯基或苄基,或 R
1
和 R
2
与所连接的氮原子一起形成
哌嗪、
哌啶、
咪唑或吗啉环。