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

A novel ternary GO@SiO2‐HPW nanocomposite as an efficient heterogeneous catalyst for the synthesis of benzazoles in aqueous media

“…The recently reported methods mostly employed homogeneous catalysts that require special work‐up and separation techniques for the recovery and recycling from the reaction environment. Some other catalysts such as mesoporous titania‐iron(III) oxide, CuO/silica, β‐cyclodextrin, Pt‐TiO 2 , α‐MoO 3 nanobelts, Fe 3 O 4 /SiO 2 /(CH 2 ) 3 N + Me 3 Br − 3 core–shell nanoparticles, and Fe 3 O 4 ‐SiO 2 ‐(NH 4 ) 6 Mo 7 O 24 magnetic core–shell nanocomposite were also used in alleviating some of the limitations. Most of these methods suffer from some drawbacks, such as the use of highly toxic or expensive reagent, long reaction times, tedious work‐up procedures, low yields of products, and, in some cases, harsh reaction conditions.…”

Ionic Liquid-Functionalized Titanomagnetite Nanoparticles as Efficient and Recyclable Catalyst for Green Synthesis of 2,3-Dihydroquinazolin-4(1H)-ones

“…On the other hand, the surface modification of these NPs using ionic liquids (ILs) is another strategy for improving the catalytic function of these nanomaterials in organic reactions and industrial processes. The promising advantages of this strategy are environmental benignity, high thermal stability, high catalytic efficiency, reusability, negligible vapor pressure, low viscosity, easy handling and separation from the products due to their heterogeneous behavior [22][23][24][25].…”

Expeditious synthesis of diverse spiro fused quinoxaline derivatives using magnetically separable core–shell CoFe2O4@SiO2‐SO3H nanocatalyst under ultrasonication

“…Surface coating onto the core nanoparticles with a shell material gives excellent protection of the core towards further chemical transformation leading to stability of the inner core material from aggregation. Easy surface modification of the shell portion with various catalytically active species can also act as catalytic support for chemical transformations without disrupting the active sites of catalysts . Usage of silica coating is beneficial due to its chemically inert nature and presence of active silanol groups on the surface of coated silica that can be readily functionalized by reacting with various coupling agents .…”