Fe3O4/SiO2/(CH2)3N+Me3Br3 − core–shell nanoparticles: A novel catalyst for the solvent-free synthesis of five- and six-membered heterocycles FEATURED

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The application of magnetite in the field of catalysis is becoming an interesting area of research. Functionalized magnetic nanoparticles
(MNPs) have been employed in organic synthesis, showing excellent catalytic activities in oxidation , hydrogenation , C\C coupling
, dihydroxylation of olefins, and amination reactions. Currently, much attention is focused on the synthesis of magnetic core–shell
structures by coating a SiO2 shell around a preformed nanoparticle . Magnetic nanoparticles are efficient, readily available, heterogeneous
catalysts with outstanding stability. Most of supported catalysts are separated by filtration or centrifugation,which cause the loss of catalyst.
To overcome this drawback, magnetic nanoparticles have emerged as effective supports because they can be separated from the reaction
mixture by an external permanent magnet.

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Catalysis Communications 63 (2015) 41–46 ScienceDirect