Journal
BULLETIN OF THE KOREAN CHEMICAL SOCIETY
Volume 33, Issue 8, Pages 2724-2730Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.5012/bkcs.2012.33.8.2724
Keywords
Supported acidic ionic liquid; Aerosil silica; Heterogeneous catalysis; Solvent-free conditions
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Funding
- Islamic Azad University, Mashhad Branch
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A new heterogeneous acidic catalyst was successfully prepared by impregnation of silica (Aerosil 300) by an acidic ionic liquid, named 1-(4-sulfonic acid)butylpyridinium hydrogen sulfate [PYC4SO3H][HSO4], and characterized using FT-IR spectroscopy, the N-2 adsorption/desorption analysis (BET), thermal analysis (TG/DTG), and X-ray diffraction (XRD) techniques. The amount of loaded acidic ionic liquid on Aerosil 300 support was determined by acid-base titration. This new solid acidic supported heterogeneous catalyst exhibits excellent activity in the synthesis of 2-aryl-2,3-dihydroquinazolin-4(1H)-ones by cyclocondensation reaction of 2-aminobenzamide with aromatic aldehydes under solvent-free conditions and the desired products were obtained in very short reaction times with high yields. This catalyst has the advantages of an easy catalyst separation from the reaction medium and lower problems of corrosion. Recycling of the catalyst and avoidance of using harmful organic solvent are other advantages of this simple procedure.
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