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A nanosilica-supported dual acidic ionic liquid on the basis of 1-methyl-3-(4-sulfobutyl)imidazolium hydrogen sulfate was synthesized and used as an efficient, green, non-corrosive, non-toxic, heterogeneous, and reusable catalyst for the synthesis of some new and known substituted flavanones. The synthesis was done by the condensation of 2'-hydroxyacetophenone with different aldehydes and the subsequent cyclization of the resulting 2'-hydroxychalcone in the presence of the catalyst. High yields of the products, short reaction times, and solvent-free conditions characterize this new method.
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We are grateful to Research Council of K. N. Toosi University of Technology for partial financial support of this work.
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Supporting material to this article containing 1H and 13C NMR spectra and mass spectra of flavanones 4b–d,f,l,m is available for the authorized users.
Published in Khimiya Geterotsiklicheskikh Soedinenii, 2015, 51(6), 526–530
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Rostamizadeh, S., Zekri, N. & Tahershamsi, L. Nanosilica-supported dual acidic ionic liquid as a heterogeneous and reusable catalyst for the synthesis of flavanones under solvent-free conditions. Chem Heterocycl Comp 51, 526–530 (2015). https://doi.org/10.1007/s10593-015-1728-z
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DOI: https://doi.org/10.1007/s10593-015-1728-z