TY - JOUR ID - 52618 TI - Recyclable Boron Sulfonic Acid as an Environmentally Benign Catalyst for the One-Pot Synthesis of Coumarin Derivatives under Solvent-Free Condition JO - Journal of Sciences, Islamic Republic of Iran JA - JSCIENCES LA - en SN - 1016-1104 AU - Rezayati, S. AU - Sajjadifar, S. AD - Department of Chemistry, Payame Noor University, PO BOX 19395-4697 Tehran, Islamic Republic of Iran Y1 - 2014 PY - 2014 VL - 25 IS - 4 SP - 329 EP - 337 KW - Silica boron sulfonic acid KW - Heterogeneous catalysts KW - Pechmanncondensation KW - Solvent-free KW - Brønsted acid and Lewis acid catalyst DO - N2 - 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. UR - https://jsciences.ut.ac.ir/article_52618.html L1 - https://jsciences.ut.ac.ir/article_52618_9c0a8ad5c8b28740f3fa36184dbd0d06.pdf ER -