A facile synthesis of some new pyrazolo[1,5-a]pyrimidine heterocyclic disazo dyes and an evaluation of their solvatochromic behaviour

被引：46
|
作者：
Tsai, Pi Chen [1 ]
Wang, Ing Jing [1 ]
机构：
[1] Natl Taiwan Univ Sci & Technol, Dept Polymer Engn, Taipei 10772, Taiwan
来源：
DYES AND PIGMENTS | 2007年 / 74卷 / 03期
关键词：
hetarylazopyrazole; dihetarylazo-pyrazolo[1,5-a]pyrimidine; disazo dyes; solvents' effect;
D O I：
10.1016/j.dyepig.2006.03.022
中图分类号：
O69 [应用化学];
学科分类号：
081704 ;
摘要：
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 hetarylazornalononitriles 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, H-1 NMR and mass). The solvatochromic behaviour in various solvents was evaluated. (c) 2006 Elsevier Ltd. All rights reserved.
引用
收藏
页码：578 / 584
页数：7
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