STRUCTURE REACTIVITY CORRELATIONS OF AZO REACTIVE DYES BASED ON H-ACID .1. NMR CHEMICAL-SHIFT VALUES, PKA VALUES, DYESTUFF AGGREGATION AND DYEING BEHAVIOR

In this series of papers we report on structure reactivity correlations with respect to the degradation of dyestuffs. For this purpose a series of monoazo vinylsulphone/monochlorotriazine reactive dyes, based on H-acid with systematically varied substituents, was investigated in aqueous solution as well as on cellulosic substrates. In the first part we discuss the selected dyes, their synthesis, characterization, dyeing behaviour and some features which are pertinent to an understanding of the fading reactions, namely, the pKa values of the dyes and their aggregation behaviour.