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Molybdic Acid-Functionalized Nano-Fe3O4@TiO2 as a Novel and Magnetically Separable Catalyst for the Synthesis of Coumarin-Containing Sulfonamide Derivatives

Jamileh Etemad Gholtash, Mahnaz Farahi, Bahador Karami, Mahsa Abdollahi

Abstract


Supported molybdic acid on nano-Fe3O4@TiO2 (Fe3O4@TiO2@(CH2)3OMoO3H) has been successfully prepared, characterized and applied as a catalyst for the synthesis of sulfonamide containing coumarin moieties. The prepared Fe3O4 nanoparticles by coprecipitation of Fe2+ and Fe3+ ions were treated with tetraethyl orthotitanate to obtain Fe3O4@TiO2. By anchoring 3-chloropropyltriethoxysilan on Fe3O4@TiO2 followed by reacting with molybdic acid, the desired catalyst was produced. The synthesized catalyst was characterized using XRD, SEM, EDS, FT-IR and VSM analysis. Fe3O4@TiO2@(CH2)3OMoO3H was used as a catalyst for the synthesis of sulfonamide containing coumarin moieties via a three-component reaction of aryl aldehydes, para-toluenesulfonamide and 4-hydroxycoumarin or 5,7-dihydroxy-4-methylcoumarin. The catalyst recovery test showed the catalyst is highly reusable without losing its activity.


Keywords


Nanocatalyst; p-toluenesulfonamide; aromatic aldehydes; 4-hyroxycoumarin; 5,7-dihydroxy-4-methylcoumarin

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DOI: http://dx.doi.org/10.17344/acsi.2020.5825

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Copyright (c) 2020 Jamileh Etemad Gholtash, Mahnaz Farahi, Bahador Karami, Mahsa Abdollahi

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