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A new series of azo reactive dyes containing free chlorine atoms have been synthesized. The synthetic methodology involves the diazotization of 4′4-diamino diphenylamine-2-sulfonic acid (2) followed by azo coupling with 1-amino-8-naphthol-3,6-disulfonic acid (3) in alkaline medium to yield intermediate dye (4). Condensation of the latter with 1,3,5-trichlorotriazine afforded the cyanurated dye (5)...
A new series of 4-amino-1-phenyl-5-pyrazolone based azo acid dyes (3a–g) has been synthesized from p- Sulphophenyl methyl pyrazolone (1). The synthetic methodology involved the nitrosation of p-sulphophenylmethylpyrazolone followed by reduction to 1-(p-sulphophenyl)-3-methyl-4-amino-5-pyrazolone. Diazotization of intermediate 1-(p-sulphophenyl)-3-methyl-4-amino-5-pyrazolone and coupling with 1-phenyl-5-pyrazolone...
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