Abstract
Progress in azo dye chemistry during the last twenty years has been determined to a large extent by the development of new heterocyclic coupling compounds, which have become most important in disperse dyes. From a vast amount of available information, a selection had to be made for the following review, and preference was given to topics with technical importance or with a special interest from the point of view of the chemistry involved. Among the subjects discussed are pyrazolones, iminopyrazoles, pyridones, aminopyrlmidines, aminopyridines, hydrochinolines, aminothiazoles and some special aspects of the chemistry of cationic dyes are mentioned.
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