Nanocrystalline TiO2–HClO4 catalyzed three-component preparation of derivatives of 1-amidoalkyl-2-naphthol, 1-carbamato-alkyl-2-naphthol, 1-(α-aminoalkyl)-2-naphthol, and 12-aryl-8,9,10,12-tetrahydrobenzo[a]-xanthen-11-one

Synthesis and characterization of Fe3O4@THAM‐SO3H as a highly reusable nanocatalyst and its application for the synthesis of dihydropyrano[2,3‐c]pyrazole derivatives

“…These nanocatalysts have small size and large external surface areas that allow great accessibility of substrates to the surface‐bound active catalytic sites . Also, their applications are increased due to their superior characteristics such as easily removable from the reaction mixture using an external magnet and reuse for several times without significantly reducing in its catalytic activity …”

Revisiting the Betti Synthesis: Using a Cheap, Readily Available, Recyclable Clay Catalyst under Solventless Conditions

“…Conversely, heterogeneous catalysts can be usually reused and recycled and studies involving nanomagnesium oxide, nanomagnetite, nanotitania‐perchloric acid and nanosilica‐boric acid were greener because they gave excellent yields in short reaction times usually in neat conditions . Yet, nanocatalysts are more difficult and expensive to prepare, more problematic to separate from the crude reaction mixture (centrifugation) whilst the latter catalysts involve the use of the highly corrosive and non‐environmentally benign perchloric acid and boric acid respectively.…”

Design and characterization of Dendrimer of MNPs as a novel, heterogeneous and reusable nanomagnetic organometallic catalyst for one‐pot synthesis of hydroxyl naphthalene‐1,4‐dione derivatives under solvent‐free conditions

“…The use of heterogeneous catalysts has been widely studied. These catalysts are easily removable from the reaction media by simple filtration after completion of the reaction and in many cases, they are reusable . Magnetic core‐shell nanostructures were forecast as magnetic strong catalysts in organic reactions.…”

“…The existence of many hydroxyl groups on the γ‐Fe 2 O 3 MNPs surface leads to a reaction with alkoxysilane reagents such as tetraethyl orthosilicate (TEOS) to form Si‐O bonds and provide reaction sites for further functionalization of γ‐Fe 2 O 3 /SiO 2 MSNPs . For the modification and functionalization of the surface of γ‐Fe 2 O 3 /SiO 2 MSNPs, the (3‐aminopropyl)triethoxysilane (APTES) and some silane reagents as potential candidates were used …”