Synthesis of azo dyes in the presence of a solid acid catalyst under various conditions

Azo dyes have been synthesized via coupling of diazotized aromatic amines with activated aromatic compounds1. Azo compounds are the most widely class of industrial synthesized organic dyes due to their versatile application in various fields2. In such new method, different kinds of aromatic amines, with electron-withdrawing groups as well as electron-donating groups, were rapidly converted to the corresponding azo dyes in the presence of NaNO2 and solid acid catalyst at room temperature3.In this work we wish report the simple demonstrating and convenient method for the synthesis of azo dyes. Short reaction times, Simple reaction, high yields, clean process, simple methodology, conference system, easy work-up and green conditions are advantages of this protocol (Fig.1).

Keywords:

Diazo coupling , Azo dyes , Solid acid catalyst , Aromatic amines