Silica-supported HClO4 and KHSO4 as reusable green catalysts for sulfonation of aromatic compounds under solvent-free conditions
Journal: Asian Journal of Green Chemistry (Vol.1, No. 2)Publication Date: 2017-10-01
Authors : Touheeth Fatima Yeike Hemanth Sriram Mukka Satish Kumar Marri Venkateswarlu Kamatala Chinna Rajanna;
Page : 69-77
Keywords : Si-supported BrØnsted acids; Green reuasble catalysts; NaHSO3; Sulfonation; Aromatic compounds;
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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Last modified: 2018-01-28 14:28:38