| 摘要 |
Couplers for hair coloring compositions for oxidative dyeing of hair are compounds of formula (1):wherein X is selected from halogen; R<3 >is selected from the group consisting of C1 to C2 alkyl and hydroxyethyl; and R, R<1 >and R<2 >are each independently selected from C1 to C22 alkyl or C1 to C22 mono or dialkyl groups, or two of R, R<1 >and R<2 >together with the the nitrogen atom to which they are attached form a C3 to C6 cycloaliphatic or a C3 to C14 aromatic group, the cycloaliphatic or aromatic group optionally containing in their rings one or more hetero atoms selected from O, S and N atoms.
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