An Eco-Friendly Approach for the Synthesis of Azocoumarin Dye Using Cation Exchange Resins

Fadia Alhaj Hussien
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Abstract

An azo dye bearing coumarin moieties were prepared by diazotization of 4-Nitro aniline using Amberlyst-15 as an acid catalyst then coupling of the obtained diazonium salt with coumarin. The obtained dye were characterized via UV-Vis, FT-IR, and 1H and 13C NMR spectroscopy This green methodology aims to overcome the limitations of the diazotisation traditional method such as using of strong acids and toxic solvents, modest yields, and difficult purification, Moreover, the attractive advantages of the process include mild conditions with excellent conversions, avoidance of harmful acids, simple product isolation process, selective, reduce by-products, inexpensive procedure and recyclability of the catalyst.
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阳离子交换树脂合成偶氮香豆素染料的环保方法研究
以琥珀酸酯-15为酸催化剂,将4-硝基苯胺重氮化,然后将重氮盐与香豆素偶氮化,制备了含有香豆素基团的偶氮染料。该绿色方法旨在克服传统重氮化方法的局限性,如使用强酸和有毒溶剂,收率低,纯化困难等,而且该方法具有条件温和,转化率高,避免有害酸,产物分离过程简单,选择性,减少副产物的优点。低廉的工艺和催化剂的可回收性。
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