| abstract |
Process for dyeing keratin fibers by using derivatives of formula: <IMAGE> (I) where: R1=H, lower alkyl or SiR11R12R13; R2 and R3, which may be identical or different, =H, alkyl, carboxyl, alkoxycarbonyl or -COOSiR11R12R13; R4 to R7, which may be identical or different, =H or an O-Z group, where Z=H, C1-C20alkyl, aralkyl, formyl, C2-C20acyl, C3-C20alkenyl, -SiR11R12R13, -P(O)(OR8)2, R8OSO2; or a heterocycle which may contain a P(O)(OR8) or CR9R10 group; with the reservation that at least two of R4 to R7 denotes OZ or form a ring, and that at least one of R4 or R7 represents OZ; R8 and R9=H, lower alkyl; R10=alkoxy, mono- or dialkylamino; R11, R12 and R13, which may be identical or different, are alkyl groups; or their alkali metal, alkaline-earth metal, ammonium and amine salts. |