| 摘要 |
A hydroxypropylated 2-nitro-p-phenylenediamine of formula (I), wherein R1 is a C1-4 alkyl, beta -hydroxyethyl, beta -hydroxypropyl or gamma -hydroxypropyl radical; R2 and R3 independently represent a beta -hydroxyethyl, beta -hydroxypropyl, gamma -hydroxypropyl or beta , gamma -dihydroxypropyl radical, with the proviso that at least one of R1, R2 and R3 is a gamma -hydroxypropyl radical, while the other two are not both a beta -hydroxyethyl radical; and cosmetically acceptable salts thereof. This compound may be used for directly dyeing hair to give blue through purplish blue shades which are wash-fast, light-fast, weatherproof and sweat resistant.
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