Preparation and catalytic study on a novel amino-functionalized silica-coated cobalt oxide nanocomposite for the synthesis of some indazoles

Abstract

In this research an efficient synthesis of a novel nanocomposite including SiO 2 @(3-aminopropyl)triethoxysilane-coated cobalt oxide (Co 3 O 4 ) nanocomposite has been reported by three step method. The structure and magnetic characterization of Co 3 O 4 @SiO 2 @NH 2 have been done by using various spectroscopic analyses which include FT-IR, X-ray powder diffraction, scanning electron microscopy, transmission electron microscopy, energy dispersive X-ray spectroscopy and vibrating sample magnetometry. Amino-functionalized SiO 2 coated Co 3 O 4 nanocomposite exhibited superparamagnetic behavior and strong magnetization at room temperature. The average crystallite sizes of the Co 3 O 4 are 23.7 nm. The obtained magnetic nanocomposite showed excellent catalytic activity as a new heterogeneous magnetic catalyst for the synthesis of some indazole derivatives under mild reaction conditions along with high level of reusability.

Magnetically Recyclable Fe3O4/GO-NH2/H3PMo12O40 Nanocomposite: Synthesis, Characterization, and Application in Selective Adsorption of Cationic Dyes from Water

“…57 The presence of Si-O bond was confirmed by a strong band at about 1116 cm −1 assigned to the Si-O-C stretching vibration. 58,59 Also, two broad bands at 3430 and 1630 cm -1 can be ascribed to the stretching and bending modes of -NH 2 groups, respectively. The presence of the anchored propyl chain of APTES was confirmed by C-H stretching vibrations at 2926 and 2850 cm .…”

H3PMo12O40‐immobilized chitosan/Co3O4: A novel and recyclable nanocomposite for the synthesis of pyrimidinedione derivatives

“…Magnetic nanoparticles (MNPs) as a solid support material have been widely utilized for the design of heterogeneous catalysts in many MCRs . Other important features of these magnetic catalysts are high stability, low toxicity, easy synthesis and high catalytic activities.…”

Synthesis and Antibacterial Evaluation of Some New 1,4-Dihydropyridines in the Presence of Fe3O4@Silica Sulfonic Acid Nanocomposite as Catalyst

“…In recent years, the magnetically sulfonic acids were applied as an effective nanocatalyst in many organic reactions such as: preparation of 3,6-di(pyridin-3-yl)-1H-pyrazolo [3,4-b]pyridine-5-carbonitriles, 24 pyrano coumarins, 25 amides, 26 quinazoline derivatives, 27 and formylation of alcohols and amines. 28 In continue of our attempts towards the improvement of the synthetic methods using heterogeneous catalysts, [29][30][31][32][33] Here we report a new and efficient pathway for the preparation of 1,4-DHPs via multi-component synthesis of arylamine, dimethyl acetylenedicarboxylate, aromatic aldehyde and ethyl acetoacetate by using Fe 3 O 4 @silica sulfuric acid core-shell nanocomposite (Scheme 1).…”