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

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.