Synthesis and Characterization of Fe3O4@SiO2 NPs as an Effective Catalyst for the Synthesis of Tetrahydrobenzo[a]xanthen-11-ones

Abstract

In this research, the significant application of Fe 3 O 4 @SiO 2 core-shell nanoparticles as efficient, green, robust, cost-effective and recoverable nanocatalyst for the multi-component reaction of aldehydes, 2-naphthol and dimedone has been developed in aqueous ethanol media under reflux conditions. In the presented procedure we had avoided to use of hazardous reagents and solvents and therefore this method can be considered as a green alternative pathway in comparison with the previous method. Simple procedure, environmentally benign, excellent yields, short reaction times, simple purification and facile catalyst separation are advantages of this protocol. Characterization and structural elucidation of the prepared products have been done on the basis of chemical, analytical and spectral analysis. In addition, the heterogeneous nanoparticles were fully characterized by FT-IR, XRD, EDX, VSM and SEM analysis.

Phase Structure and Heat Generation in the Co-Precipitated Magnetite Nanoparticles

“…• C. Core-shell structure was obtained using the modified Stöber process [10,11]. (1217) In the reaction 30 mg of iron-oxide nanoparticles were dispersed in 100 ml of 2-propanol, 12 ml of distilled water and 15 ml of 25% ammonia solution and sonicated for 1 h. Subsequently, 3.2 ml of tetraethyl orthosilicate (TEOS) was added and sonicated for another 6 h. The powder was filtered, washed with 2-propanol and dried at 20…”

Sonochemical synthesis of chromenes catalyzed by L-phenyl alanine-attached nano-Fe3O4@SiO2

“…The core/shell Fe 3 O 4 nanoparticles are easily prepared and have been widely studied due to their unique physical properties. The core/shell Fe 3 O 4 nanoparticles can be recycled from the medium of reaction by external magnetic field (13,14). The surface of MNPs can be functionalized simply through suitable surface modifications to provide the attachment of a variety of favorable functionalities (15)(16)(17)(18)(19)(20)(21)(22)(23)(24).…”

Preparation and catalytic study on a novel amino-functionalized silica-coated cobalt oxide nanocomposite for the synthesis of some indazoles

“…[11][12][13] This led to the idea of preparing an active catalyst, Co 3 O 4 @SiO 2 @NH 2 , through morphology-controlled synthesis which ensure that faces which are active specifically are exposed predominantly at the surface. As well as, to the best of our knowledge, no attempt has been made to synthesis of Co 3 In continuing our efforts towards the development of efficient and environmentally benign heterogeneous catalysts, [14][15][16][17][18] herein, Co 3 O 4 @SiO 2 @NH 2 nanocomposite was prepared as a highly efficient magnetic catalyst by a simple method. The main goal of this catalytic synthesis was to introduce a novel and effective magnetic nanocomposite to expand the use of these types of composites for organic reactions.…”