Preparation and characterization of a silica‐based magnetic nanocomposite and its application as a recoverable catalyst for the one‐pot multicomponent synthesis of quinazolinone derivatives

Abstract

An environmentally benign magnetic silica-based nanocomposite (Fe 3 O 4 /SBA-15) as a heterogeneous nanocatalyst was prepared and characterized using Fourier transform infrared and ultraviolet-visible diffuse reflectance spectroscopies, scanning electron microscopy, X-ray diffraction, vibrating sample magnetometry and Brunauer-Emmett-Teller multilayer nitrogen adsorption. Its catalytic activity was investigated for the one-pot multicomponent synthesis of 2,3-dihydroquinazolin-4(1H)-ones starting from isatoic anhydride, ammonium acetate and various aldehydes under mild reaction conditions and easy work-up procedure in refluxing ethanol with good yields. The nanocatalyst can be recovered easily and reused several times without significant loss of catalytic activity.

Preparation of Fe3O4/SiO2/TiO2/CeVO4 Nanocomposites: Investigation of Photocatalytic Effects on Organic Pollutants, Bacterial Environments, and New Potential Therapeutic Candidate Against Cancer Cells

“…Despite the good characteristics of the photocatalyst in water treatment, the lack of appropriate recovery of TiO 2 nanocomposites from treated water is a major problem when it comes to applying extensively. To overcome the problem of recovering catalytic nanoparticles from water, magnetic catalysts have been focused (Maleki and Kamalzare, 2014;Maleki et al, 2015;Maleki et al, 2016a;Maleki et al, 2016b;Maleki et al, 2017;Maleki et al, 2019b;Maleki et al, 2019c;Maleki et al, 2019a;Maleki et al, 2019d). After the water treatment process, the magnetic separation of Fe 3 O 4 /TiO 2 by using an external electromagnetic field recycles magnetic composites.…”

Green synthesis of silver nanoparticles using Eucalyptus comadulensis leaves extract and its immobilization on magnetic nanocomposite (GO‐Fe3O4/PAA/Ag) as a recoverable catalyst for degradation of organic dyes in water

“…The agglomeration of nanoparticles during the catalytic reaction is one of their disadvantages . Separation of nanoparticles from the reaction medium using simple methods such as filtration and centrifugation is difficult . To overcome these difficulties, different solid supports such as TiO 2 , graphene, mesoporous materials, and Fe 3 O 4 were applied for the immobilization of metal nanoparticles and the construction of the heterogeneous nanocatalyst .…”

“…[12][13][14][15][16] Separation of nanoparticles from the reaction medium using simple methods such as filtration and centrifugation is difficult. [17][18][19][20] To overcome these difficulties, different solid supports such as TiO 2 , graphene, mesoporous materials, and Fe 3 O 4 were applied for the immobilization of metal nanoparticles and the construction of the heterogeneous nanocatalyst. [21][22][23][24][25][26][27][28][29][30][31][32] Graphene oxide (GO) has been identified as a new group of interesting catalysts because of their unique properties such as good stability, large surface area, high mechanical strength, and good adsorption capacity.…”

Design and development of a novel magnetic camphor nanospheres core/shell nanostructure

“…In continuation of our research on green nanocatalysts and organic synthesis [21][22][23][24][25][26][27][28], herein, we wish to report Fe 3 O 4 /camphor nanospheres as a novel, efficient, ecofriendly, superparamagnetic and heterogeneous catalyst and investigation of its application in the synthesis of bamino carbonyl compounds 4 via the condensation reaction of aniline 1, an aldehyde 2 and a ketone 3 (Scheme 1).…”