%0 Journal Article %T Recyclable Boron Sulfonic Acid as an Environmentally Benign Catalyst for the One-Pot Synthesis of Coumarin Derivatives under Solvent-Free Condition %J Journal of Sciences, Islamic Republic of Iran %I University of Tehran %Z 1016-1104 %A Rezayati, S. %A Sajjadifar, S. %D 2014 %\ 12/01/2014 %V 25 %N 4 %P 329-337 %! Recyclable Boron Sulfonic Acid as an Environmentally Benign Catalyst for the One-Pot Synthesis of Coumarin Derivatives under Solvent-Free Condition %K Silica boron sulfonic acid %K Heterogeneous catalysts %K Pechmanncondensation %K Solvent-free %K Brønsted acid and Lewis acid catalyst %R %X A mild and green method has been developed for the preparation of coumarins derivatives through the one-pot reactions. In our study,various phenols and ethyl acetoacetate compound in which we used silica-supported boron sulfonic acid [SiO2/B(SO4H)3] as a new, highly efficient and tri-functional inorganic Brønsted acid catalyst were processed under solvent-free condition and thermal. The catalysts were separated easily from reaction mixture, regenerated after a simple activation step and reused at least six times without significant loss in catalytic activity. The most significant features of this procedure are:short period of conversion and excellent yields, simple experimental procedure, environmentally benign, the elimination of corrosive liquid acids and green aspects by avoiding toxic conventional catalysts and solvents. %U https://jsciences.ut.ac.ir/article_52618_9c0a8ad5c8b28740f3fa36184dbd0d06.pdf