Ultrasound promoted and Kit‐6 mesoporous silica‐supported Fe₃O₄ magnetic nanoparticles catalyzed cyclocondensation reaction of 4‐hydroxycoumarin, 3,4‐methylenedioxyphenol, and aromatic aldehydes

Abstract

A new effective approach to synthesize a series of 7-aryl-6H,7H-[1] benzopyrano[4,3-b][1,3]dioxolo[4,5-g][1]benzopyran-6-ones was reported using Fe 3 O 4 @SiO 2 @Kit-6 as heterogeneous catalyst at room temperature under ultrasonic irradiation in aqueous media. This procedure is of great value due to its short reaction time, high yields, simple processing, and the use of easily available and magnetically recyclable heterogeneous catalyst.

Immobilization of Ni(ii) complex on the surface of mesoporous modified-KIT-6 as a new, reusable and highly efficient nanocatalyst for the synthesis of tetrazole and pyranopyrazole derivatives

“…In this regard the synthesis of aryl tetrazoles, cyclocondensation reactions, oxidation of alcohols, oxidation of sulfides and oxidative coupling of thiols can be mentioned. 31,32…”

An effective and eco‐friendly sonochemical multicomponent synthesis of trisubstituted imidazoles via modified silica‐coated cobalt ferrite nanoparticles by tungstic acid

“…It is used to increase the reaction rate, product yields, and product selectivity and decrease the required energy for the reaction and byproduct construction. [2,[24][25][26] Magnetic nanoparticles (MNPs) have a specific position in the field of nanocatalyst because of their incomparable properties, such as small size, large surface area-to-volume ratio, excellent magnetic properties, and surface modifiability. [27][28][29][30] The exterior shell-priming of MNPs with hydrophobic silanes, such as tetraethylorthosilicate (TEOS), has attracted great attention because it boosts the nanoparticles' (NPs) constancy in aqueous solutions, separates interparticle, minimizes degradation, and provides an appropriate surface for further modifications.…”

Synthesis and evaluation of the antioxidant activity of new spiro-1,2,4-triazine derivatives applying Ag/Fe3O4/CdO@MWCNT MNCs as efficient organometallic nanocatalysts

“…This is the reason why the mixture of two or more metals and their curing mechanisms allow the change in the properties of material surfaces for the optimization of the properties for a particular goal ( Zhang et al, 2012 ; Lin-Bing et al, 2015 ). Accordingly, the combination of metal oxide catalysts and their nanocomposite structure has exhibited the production of heterocyclic compounds according to green rules with high efficiency ( Kalantari et al, 2020 ; Abdolmohammadi et al, 2021 ; Khalilzadeh et al, 2021 ). Among the metal oxide nanoparticles, Fe 3 O 4 magnetic nanoparticles (MNPs) are important because of their high surface area, simply removed from reaction, and their application in MCRs several times.…”