| 摘要 |
Couplers for hair coloring compositions for oxidative dyeing of hair are compounds of the formula (1):wherein X is selected from halogen and R<5>SO4; R, R<1>, R<2 >and R<5 >are each individually selected from C1 to C22 alkyl and C1 to C22 mono or dihydroxyalkyl and R<3 >and R<4 >are individually selected from C1 to C6 alkyl groups, C1 to C6 hydroxyalkyl, C1 to C6 alkoxy, C1 to C6 aminoalkyl or R<3 >and R<4 >together form a C1 to C5 alkylene group.
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