Stable diazonium salts of weakly basic amines—Convenient reagents for synthesis of disperse azo dyes
作者:Jinjing Qiu、Bingtao Tang、Benzhi Ju、Yuanji Xu、Shufen Zhang
DOI:10.1016/j.dyepig.2016.08.026
日期:2017.1
A new synthetic strategy for industrially important deep-shade disperse azo dyes was presented in this study. The key procedure is to prepare stable solid diazonium salts of weakly basic amines in the absence of concentrated sulfuric acid. Diazotization by tert-butyl nitrite in ethyl acetate was allowed to proceed in the presence of equivalent 1,5-naphthalenedisulfonic acid as stabilizer of diazonium
在这项研究中提出了一种新的工业重要的深阴影分散偶氮染料的合成策略。关键步骤是在不存在浓硫酸的情况下,制备稳定的弱碱性胺固体重氮盐。重氮化由叔在当量的1,5-萘二磺酸作为重氮盐的稳定剂和氢供体反应的存在下,使乙酸乙酯中的亚硝酸丁酯进行反应。分离出的固体重氮盐显示出良好的热稳定性。随后,通过将制备的固体重氮盐与一系列芳族叔胺进行偶氮偶联,合成相应的分散偶氮染料。制备的偶氮染料反应时间短,产率高,反应条件温和,实验过程简单,能耗低。