title: Nanorod vanadatesulfuric acid as a novel, recyclable and heterogeneous catalyst for the one-pot synthesis of tetrahydrobenzopyrans.
abstract: Vanadatesulfuric acid (VSA), as a novel and heterogeneous nanorod catalyst, was used for an efficient synthesis of tetrahydrobenzo[b]pyrans using an aldehydes, 1,3-cyclohexanediones or beta-ketoester and malononitrile in C2H5OH/H2O mixture under reflux conditions. VSA is prepared via the reaction of sodium metavanadate and chlorosulfonic acid in high purity. The catalyst was characterized by FT-IR, XRD, TEM and EDAX analysis. Compared to the conventional method, this method consistently has the advantage of high yields, simple workup, short reaction times and reusability of the catalyst.
authors.affiliation: Department of Chemistry, Yasouj University, Yasouj 75918-74831, Iran.
authors.forename: Masoud
authors.initials: M
authors.lastname: Nasr-Esfahani
authors.forename: Tooba
authors.initials: T
authors.lastname: Abdizadeh
mesh_terms: D001578:Benzopyrans / Q000138:chemical synthesis*; D002384:Catalysis; D008422:Materials Testing; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure; D043942:Nanotubes / Q000737:chemistry* / Q000648:ultrastructure; D010316:Particle Size; D059027:Recycling; D013464:Sulfuric Acids / Q000737:chemistry*
chemical_list: D001578:Benzopyrans; D013464:Sulfuric Acids; C033158:sulfuric acid