The present invention is directed to dye mixtures comprising structures of formula and their production and their use for dyeing textiles and in particular for dyeing aramid fibres.
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Page/Page column 12; 13
(2018/07/05)
Action of Sodium Dithionite on Some Cationic Dyes
Sodium dithionite (SDT) has been developed as a useful reagent to dequaternize a variety of cationic dyes.Triarylmethane dyes are converted into leuco bases; however, hemicyanines smoothly undergo dehydrochlorination.Phenothiazine and phenoxazine dyes on reduction with SDT give unstable leuco bases, which can be isolated as their N-benzoyl derivatives.The IR, PMR and mass spectral studies of the leuco bases or the dequaternized products have been found to be useful for structure elucidation of the cationic dyes.
Ayyangar, N. R.,Khanna, I. K.
p. 763 - 766
(2007/10/02)
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