Article ID Journal Published Year Pages File Type
178019 Dyes and Pigments 2007 7 Pages PDF
Abstract

Hetarylmalononitriles (thiazolylmalononitrile and benzothiazolylmalononitrile) were prepared by the coupling reaction of malononitrile with heterocyclic amines in nitrosyl sulfuric acid. 4-Hetarylazo-3,5-diaminopyrazole compounds were obtained by the reaction of hetarylmalononitriles with hydrazine hydrate (64%). Both compounds can react with arylazo- and hetarylazomalononitriles to give 3,6-di-(aryl or hetaryl)-azo-2,5,7-triaminopyrazolo[1,5-a]pyrimidine heterocyclic disazo dyes. These dyes were characterized by elemental and spectral analyses (IR, 1H NMR and mass). The solvatochromic behaviour in various solvents was evaluated.

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Physical Sciences and Engineering Chemical Engineering Chemical Engineering (General)
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