| 摘要 |
The coupler component in a dyeing agent also containing a carrier and a developer component and used for keratinous fibers, especially human hair, is an m-phenylenediamine derivative (I) or its salts. Some (I) are claimed as new compounds. The coupler component in a dyeing agent also containing a carrier and a developer component and used for keratinous fibers, especially human hair, is an m-phenylenediamine derivative of formula (I) or its salts. A1 = H, benzyl, 2-4C alkenyl, 1-4C alkyl or monohydroxyalkyl or 2-4C polyhydroxyalkyl; B1, C1 = H or 1-4C alkyl; R1 = H, halogen, 1-4C alkyl, monohydroxyalkyl or alkoxy or 2-4C polyhydroxyalkyl; R2-R4 = H, halogen, 1-4C alkyl, perfluoroalkyl, monohydroxyalkyl or alkoxy or 2-4C polyhydroxyalkyl, with the proviso that at least one of R2-R4 = H, halogen or 1-4C alkoxy; X = pyridyl or C6H3R5R6; R5, R6 = H, OH, halogen, sulfonic acid or 1-4C alkyl or alkoxy; and n = 1-4.
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