| 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 C<1> and C<2> alkyl and hydroxyethyl; and R and R<1> and R<2 >are each independently selected from C<1> to C<22> alkyl or C<1> to C<22> mono or dialkyl groups, or two of R, R<1> and R<2> together with the nitrogen atom which they are attached form a C<3> to C<6> cycloaliphatic or a C<3> to C<14> 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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