Fe3O4/SiO2/(CH2)3N+Me3Br3 – core–shell nanoparticles: An efficient catalyst for the synthesis of functionalized 5-oxo-hexahydroquinolines


Synthesis of magnetic nanoparticles (MNPs) has been of scientific and technological interest due to their potential applications in biosensors , drug delivery, bioseparation, and catalysis. Pure magnetic nanoparticles are likely to form a large aggregate, easily oxidized or dissolved in an acid medium and have fewer activating groups. Silica covered on the surface of magnetic nanocomposites prevents the aggregation induced by the magnetic dipolar attraction between MNPs. In addition, it can prevent oxidation of the Fe3O4 core by the outer atmosphere. When MNPs are used as supports, the size of material is reduced to the nanometer scale, and most of the catalytic sites on the external surface of the particles can be accessible to the substrates. The MNPs supported catalysts are readily recovered by simple magnetic decantation and can be recycled several times with no significant loss of catalytic activity.

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Iranian Journal of Catalysis 8(1), 2018, 35-39