title: Introduction of poly(4-vinylpyridinium) perchlorate as a new, efficient, and versatile solid acid catalyst for one-pot synthesis of substituted coumarins under ultrasonic irradiation.
abstract: Poly(4-vinylpyridinium) perchlorate, is a supported, recyclable, eco-benign catalyst for synthesis of substituted coumarins via Pechmann reaction using ultrasound irradiation at room temperature and neat condition in high yields with short reaction times. The catalyst was studied by FT-IR, X-ray diffraction, scanning electron microscope, thermo-gravimetric and energy dispersion X-ray analyses. All the products were extensively characterized by (1)H NMR, FT-IR, MS and melting point analyses. This methodology offers momentous improvements over various options for the synthesis of coumarins with regard to yield of products, simplicity in operation and green aspects by avoiding toxic catalysts and solvents. Further, the catalyst can be reused and recovered for several times without loss of activity.
authors.affiliation: Department of Chemistry, College of Science, University of Guilan, Rasht 41335-19141, Iran. ngkhaligh@guilan.ac.ir
authors.forename: Nader Ghaffari
authors.initials: NG
authors.lastname: Khaligh
authors.forename: Farhad
authors.initials: F
authors.lastname: Shirini
mesh_terms: D002384:Catalysis; D060326:Chemistry Techniques, Synthetic / Q000379:methods*; D003374:Coumarins / Q000138:chemical synthesis* / Q000737:chemistry*; D010472:Perchlorates / Q000737:chemistry*; D011145:Polyvinyls / Q000737:chemistry*; D013696:Temperature; D014465:Ultrasonics
chemical_list: D003374:Coumarins; D010472:Perchlorates; D011145:Polyvinyls; C019535:poly(4-vinylpyridine)