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Abstract
Supported molybdic acid on nano-Fe3O4@TiO2 (Fe3O4@TiO2@(CH2)3OMoO3H) has been successfully prepared, char-acterized and applied as a catalyst for the synthesis of sulfonamide containing coumarin moieties. The prepared Fe3O4nanoparticles 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-com-ponent reaction of aryl aldehydes, para-toluenesulfonamide and 4-hydroxycoumarin or 5,7-dihydroxy-4-methylcou-marin. The catalyst recovery test showed the catalyst is highly reusable without losing its activity.
Highlights
Nanochemistry is becoming increasingly significant which involves the synthesis and application of nanoparticles of different sizes and shapes.[1,2,3,4,5,6,7,8,9] Nanoparticles are different from their bulk counterparts and show special properties
Nano-Fe3O4 has been intensively used as catalytic supports owing to the capability of separation from the reaction mixture via an external magnet which achieves a simple separation without filtration.[16,17]
Because of reasonable needs for clean and green heterogeneous catalysts, Fe3O4@TiO2@(CH2)3OMoO3H was synthesized following the procedure shown in Scheme 1
Summary
Nanochemistry is becoming increasingly significant which involves the synthesis and application of nanoparticles of different sizes and shapes.[1,2,3,4,5,6,7,8,9] Nanoparticles are different from their bulk counterparts and show special properties. A considerable amount of attention to nanoparticles is due to their unique properties such as ease of availability, chemical inertness, high surface area to volume ratio, high activity and selectivity, thermal stability and low toxicity.[10, 11] Nanomaterials have been widely utilized as solid support material for the design of environmentally benign heterogeneous catalysts to address various economic and green chemistry issues.[12,13,14,15] Among them, magnetic nanoparticles (MNPs), especially nano-Fe3O4, have been more desirable because of their remarkable advantages. Nano-Fe3O4 has been intensively used as catalytic supports owing to the capability of separation from the reaction mixture via an external magnet which achieves a simple separation without filtration.[16,17] Supported catalysts on nano-Fe3O4 show high catalytic activity and a high degree of chemical stability and they do not swell in organic solvents
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