OICC Press International Nano Letters 2228-5326 8 1 (March 2018) 2018 04 27 Catalytic behavior of perchloric acid on silica mesoporous SBA-15 as a green heterogeneous Bronsted acid in heterocyclic multicomponent reactions 10.1007/s40089-018-0231-9 EN Ali Baghban Department of Chemistry, Faculty of Science, Payame Noor University, Tehran, IR Esmail Doustkhah Organic and Nano Group (ONG), Department of Chemistry, Faculty of Science, University of Maragheh, Maragheh, IR Sadegh Rostamnia Organic and Nano Group (ONG), Department of Chemistry, Faculty of Science, University of Maragheh, Maragheh, IR Journal Article 2018 04 27 Abstract Catalytic behavior of perchloric acid when supported to mesoporous silica SBA-15 (SBA-15/HClO 4 ) was investigated as a heterogeneous Bronsted acid. Its reactivity and leaching possibility were studied in cascade ring opening-cyclocondensation sequence of diketene and alcohol with aldehyde in the presence of either of urea or ammonium acetate. Results showed that this catalyst can be highly recyclable for several cycles.