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

Abstract

Supported molybdic acid on nano-Fe 3 O 4 @TiO 2 (Fe 3 O 4 @TiO 2 @(CH 2) 3 OMoO 3 H) has been successfully prepared, characterized and applied as a catalyst for the synthesis of sulfonamide containing coumarin moieties. The prepared Fe 3 O 4 nanoparticles by coprecipitation of Fe 2+ and Fe 3+ ions were treated with tetraethyl orthotitanate to obtain Fe 3 O 4 @TiO 2. By anchoring 3-chloropropyltriethoxysilan on Fe 3 O 4 @TiO 2 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. Fe 3 O 4 @TiO 2 @ (CH 2) 3 OMoO 3 H 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.

Novel cellulose supported 1,2-bis(4-aminophenylthio)ethane Ni(ii) complex (NiII(BAPTE)(NO3)2-Cell) as an efficient nanocatalyst for the synthesis of spirooxindole derivatives

“…In continuation of our program aimed at developing new methodologies for the preparation of green catalysts, [81][82][83][84][85][86][87][88][89][90] we have reported preparation, characterization and catalytic application of Ni II (BAPTE)(NO 3 ) 2 -Cell as a novel cellulose-based nanocomposite.…”