@article { author = {Fatima, Touheeth and Sriram, Yeike Hemanth and Kumar, Mukka Satish and Venkateswarlu, Marri and Kamatala, Chinna Rajanna}, title = {Silica-supported HClO4 and KHSO4 as reusable green catalysts for sulfonation of aromatic compounds under solvent-free conditions}, journal = {Asian Journal of Green Chemistry}, volume = {1}, number = {2}, pages = {69-77}, year = {2017}, publisher = {Sami Publishing Company}, issn = {2588-5839}, eissn = {2588-4328}, doi = {10.22631/ajgc.2017.95574.1016}, 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.}, keywords = {Si-supported BrØnsted acids,Green reuasble catalysts,NaHSO3,Sulfonation,aromatic compounds}, url = {https://www.ajgreenchem.com/article_49766.html}, eprint = {https://www.ajgreenchem.com/article_49766_512a96961a858aafec491c8a9f106b4c.pdf} }