| 摘要 |
<p>Couplers for hair coloring compositions for oxidative dyeing of hair are compounds of the formula (1): wherein X is selected from halogen and R5SO4, R, R1, R2 and R5 are each individually selected from C1 to C22 alkyl and C1 to C22 mono or dihydroxyalkyl and R3 and R4 are each individually selected fro C1 to C6 alkyl groups, C1 to C6 hzdroxyalkyl, C1 to C6 alkoxy, C1 to C ??6 ?aminoalkyl or R3 and R4 together from a C1 to C5 alklene group.</p> |
