Magnetic nano-Fe₃O₄@TiO₂/Cu₂O core–shell composite: an efficient novel catalyst for the regioselective synthesis of 1,2,3-triazoles using a click reaction

Abstract

An efficient and recoverable core–shell nanomagnetic composite was developed for regioselective synthesis of 1,2,3-triazoles using a green procedure.

In situpreparation and characterization of novel CuI‐functionalized poly[(methyl methacrylate)‐co‐maleimide] as an efficient heterogeneous catalyst in the regioselective synthesis of 1,2,3‐triazoles via click reaction: Experimental and computational chemistry

“…It is worth mentioning that the results showed alkyl and aryl halides react better than haloketones in terms of yields and reaction times. The efficiency of CuI@[PMMA‐co‐MI] in click reaction was also compared with that of previously reported catalysts under various reaction conditions (Table ) . By comparison, it can be concluded that CuI@[PMMA‐co‐MI] as a novel nanocatalyst has several merits such as higher or comparable yield of the desired product in shorter reaction time.…”

Palladium nanoparticles supported on modified hollow Fe3O4@TiO2: Preparation, characterization, and catalytic activity in Suzuki cross‐coupling reactions

“…A solution containing FeCl 3 .6H 2 O (1.35 g, 5 mmol), NaOAc.3H 2 O (3.85 g, 12.6 mmol), and 25 mL EG was added to the mixture, the mixture was stirred vigorously for 15 min, and it was transferred to a 100‐mL Teflon‐lined stainless steel autoclave and heated at 200 °C for 12 h. The black product was collected and washed with ethanol and deionized water several times, and finally dried at 80 °C in an oven overnight. By directly coating H‐Fe 3 O 4 with a layer of TiO 2 through hydrolyzing TBOT in ethanol and acetonitrile solution, H‐Fe 3 O 4 @TiO 2 spheres were synthesized . Fifty milligrams of the as‐synthesized H‐Fe 3 O 4 was dispersed in a mixed solvent containing 90 mL of ethanol and 30 mL of acetonitrile ultrasonically.…”

“…By directly coating H-Fe 3 O 4 with a layer of TiO 2 through hydrolyzing TBOT in ethanol and acetonitrile solution, H-Fe 3 O 4 @TiO 2 spheres were synthesized. [27] Fifty milligrams of the as-synthesized H-Fe 3 O 4 was dispersed in a mixed solvent containing 90 mL of ethanol and 30 mL of acetonitrile ultrasonically. Then, 0.5 mL of NH 3 .H 2 O was added to the mixture.…”

“…[22][23][24][25] As part of our continuing interest in the synthesis of magnetic nanocatalysts and metal-mediated transformations, we report here the synthesis and full characterization of a new heterogeneous catalyst involving Pd based on hollow Fe 3 O 4 @TiO 2 particles. [26][27][28][29][30][31][32][33][34][35] After preparation of the hollow Fe 3 O 4 spheres through the hydrothermal method, [36] a TiO 2 layer was applied to prevent the aggregation of nanoparticles. Functionalization of these nano-magnetic hollow spheres was done with (3-aminopropyl) triethoxysilane (APTES).…”

Ultrasound Promoted Fabrication of CuO‐Graphene Oxide Nanocomposite for Facile Synthesis of Fluorescent Coumarin Based 1,4‐disubsituted 1,2,3‐triazoles in Aqueous Media

“…[28] Additionally, it brings important advantages such as eliminates the formation of byproducts (bistriazoles and diacetylenes), removal of the catalyst from the reaction media which can be achieved by simple filtration and, especially minimize the effective metal loading for reaction (recyclability and reusability). Recently, different heterogeneous supports [29][30][31][32][33][34][35][36] such as zeolites, montmorillonite, [37] chitosan, [38,39] graphene oxide, [31,40] cellulose [33,41] have been used for immobilization of copper, but these methods have some deficiencies such as long reaction time, use of organic solvents, high temperature, tedious work-up procedure, low yield, high catalyst loading so it is worthwhile to develop a new, convenient, widely applicable, green, sustainable, feasible and regio-controlled synthetic methodology for the facile preparation of fluorescent biologically important 1,2,3-triazoles.…”