Document Type: Original Research Article

Authors

Department of Chemistry, Osmania University, Hyderabad (T.S)-500007 India

Abstract

A green protocol is described for sulfonation of aromatic compounds that has been accomplished using sodium bisulfite (NaHSO3) in the presence of reusable green heterogeneous SiO2/HClO4 and SiO2/KHSO4 (Silica-supported HClO4 and KHSO4 catalysts) under conventional and solvent-free microwave irradiation.  The reactions afforded very good yields of products within 3 to 5 hour under conventional conditions. However, the reaction times in microwave-assisted protocol are drastically reduced to 3 to 5 minutes (from 3 to 5 hour under conventional conditions) followed by increasing product yields. Moreover, the developed silica-supported catalysts could be  recycled for at least three to four times.

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