| 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 R2SO4; R3 is selected from C¿1? to c2 alkyl or hydroxyethyl; R?2¿ is selected from C¿1? to C22 alkyl and C1 to C22 mono and dihydroxyalkyl; and R is selected from of C1 to C16 alkyl, C1 to c10 hydroxyalkyl, C1 to C6 alkoxyalkyl and benzyl.</p> |
