An environmentally friendly approach to the synthesis of azo dyes based on 2-naphthol using kaolin-SO3H nanoparticles
الموضوعات : Iranian Journal of CatalysisAbdolhamid Bamoniri 1 , Bi Bi Fatemeh Mirjalili 2 , Nahid Yaghmaeiyan-Mahabadi 3
1 - Department of Organic Chemistry, Faculty of Chemistry, University of Kashan, Kashan, I.R. Iran.
2 - Department of Chemistry, College of Science, Yazd University, Yazd, I.R. Iran.
3 - Department of Organic Chemistry, Faculty of Chemistry, University of Kashan, Kashan, I.R. Iran.
الکلمات المفتاحية: Nanoparticles, Diazonium salt, 2-Naphthol, Solvent-free, Kaolin-SO3H, Diazo coupling,
ملخص المقالة :
Kaolin-SO3H nanoparticles were prepared via reaction of kaolin and chlorosulfonic acid and characterized by FT-IR, XRD, FESEM, TEM, XRF, EDS, BET and TGA. The activity of this green catalyst was probed by the synthesis of aryl diazonium salts as the starting reactant and then, their diazo coupling with 2-naphthol to form azo dyes in a solvent-free medium at room temperature. The work-up of the reaction was easy, and the catalyst was removed from the products by simple filtration. The reaction proceeded in a short time, easy purification technique, high yields, and was environmentally friendly furthering approaches to green chemistry. The products were characterized by FT-IR and NMR spectroscopy.
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