| 摘要 |
Primary intermediates for hair coloring compositions for oxidative dyeing of hair are compounds of the formula (1): wherein R<SUB>1 </SUB>and R<SUB>2 </SUB>are each independently selected from hydrogen atoms, a C<SUB>1 </SUB>to C<SUB>5 </SUB>alkyl or hydroxyalkyl group, or R<SUB>1 </SUB>and R<SUB>2 </SUB>together with the nitrogen atom to which they are attached form a 5 or 6 member cyclic ring optionally containing one or more additional atoms selected from O, N or S atoms, and n is equal to 1 or 2, with the proviso that when n is equal to 2 only one of R<SUB>1 </SUB>and R<SUB>2 </SUB>may be hydrogen.
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