Hydroxypropylated 2-nitro-p-phenylenediamines, and compositions for dyeing keratinous fibers which contain hydroxypropylated 2-nitro-p- phenylenediamines

摘要

A hydroxypropylated 2-nitro-p-phenylenediamine of formula (I), wherein R1 is a C1-4 alkyl, &bgr;-hydroxyethyl, &bgr;-hydroxypropyl or &ggr;- hydroxypropyl radical; R2 and R3 independently represent a &bgr; - hydroxyethyl, &bgr;-hydroxypropyl, &ggr;-hydroxypropyl or &bgr;,. gamma.- dihydroxypropyl radical, with the proviso that at least one of R1, R2 and R3 is a &ggr;-hydroxypropyl radical, while the other two are not both a &bgr;-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, waterproof and sweat resistant.