Touheeth Fatima - Department of Chemistry, Osmania University, Hyderabad (T.S)-۵۰۰۰۰۷ India
Yeike Hemanth Sriram - Department of Chemistry, Osmania University, Hyderabad (T.S)-۵۰۰۰۰۷ India
Mukka Satish Kumar - Department of Chemistry, Osmania University, Hyderabad (T.S)-۵۰۰۰۰۷ India
Marri Venkateswarlu - Department of Chemistry, Osmania University, Hyderabad (T.S)-۵۰۰۰۰۷ India

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.

Si-supported BrØnsted acids, Green reuasble catalysts, NaHSO₃, Sulfonation, Aromatic compounds