Affiliation:
1. Department of Organic Chemistry, Faculty of Technology and Metallurgy, Belgrade
Abstract
Over 50% of all colorants which are used nowdays are azo dyes and pigments,
and among them arylazo pyridone dyes (and pigments) have became of interest
in last several decades due to the high molar extinction coefficient, and the
medium to high light and wet fastness properties. They find application
generally as disperse dyes. The importance of disperse dyes increased in the
1970s and 1980s due to the use of polyester and nylon as the main synthetic
fibers. Also, disperse dyes were used rapidly since 1970 in inks for the
heat-transfer printing of polyester. The main synthetic route for the
preparation of azo dyes is coupling reaction between an aromatic diazo
compound and a coupling component. Of all dyes manufactured, about 60% are
produced by this reaction. Arylazo pyridone dyes can be prepared from
pyridone moiety as a coupling component, where substituent can be on
nitrogen, and diazonim salts which can be derived from different substituted
anilines or other heterocyclic derivatives. In addition, arylazo dyes
containing pyridone ring can be prepared from arylazo diketones or arylazo
ketoesters (obtained by coupling ?-diketones or ?-ketoesters with diazonim
salts) by condensation with cyanoacetamide. Disazo dyes can be prepared by
tetrazotizing a dianiline and coupling it with a pyridone or by diazotizing
aniline and coupling it with a dipyridone. Trisazo dyes can be also prepared
by diazotizing of aniline and coupling it with a tripyridone or by
hexazotizing a trianiline and coupling it with a pyridone. The main goal of
this paper is to give a brief review on the synthesis of arylazo pyridone
dyes due to the lack of such reviews. In addition, some properties of arylazo
pyridone dyes as light fastness and azo-hydrazon tautomerism are disccused.
Publisher
National Library of Serbia
Subject
General Chemical Engineering,General Chemistry
Cited by
18 articles.
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