Mild preparation of hydroxyl naphthalene-1,4-dione derivatives with nano copper(II) oxide as catalyst under ambient and solvent-free conditions

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

“…High yields of products, shorter reaction time toward other catalysts and easy separation of the catalyst from the reaction media without any noticeable loss of its activity after at least six times makes this green method suitable for applications in organic synthesis. [29] 3 ZrOCl H 2 O (Neat) 100°C 7 h 88 [33] 4 MCM-41 EtOH/Room temperature 3 h 91 [32] 5 Nano Copper(II)oxide Solvent-free/Room temperature 11 min 91 [12] 6 SBPPSA Solvent-free/Room temperature 8 min 90 [23] 7 3 -HPAA Solvent-free/Room temperature 8 min 90 [31]…”

“…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.…”

“…These catalysts are easily removable from the reaction media by simple filtration after completion of the reaction and in many cases, they are reusable. [10][11][12][13][14] Magnetic core-shell nanostructures were forecast as magnetic strong catalysts in organic reactions. Within the past few years, magnetic nanoparticles emerged as a new class of semi-heterogeneous supports for catalysts.…”

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 …”

“…[13][14][15] 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. [16][17][18][19][20] As a review of previous studies, many methods have been reported for sulfuric acid coupling as an acidic group on magnetic nanoparticles. Among them, Fe 3 O 4 @APTES@isatin-SO 3 H, [21] CoFe 2 O 4 @SiO 2 -SO 3 H, [22] Fe 3 O 4 @BNPs@SiO 2 -SO 3 H, [23] Fe 3 O 4 @zeolite-SO 3 H, [24] Fe 3-x TixO 4 -SO 3 H [25] and Fe 3 O 4 @GO-naphthalene-SO 3 H [26] are examples of catalysts.…”