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In this research study we designed and synthesized CoII(macrocyclic Schiff base ligand containing 1,4‐diazepane) immobilized on Fe3O4 nanoparticles as a novel, recyclable, and heterogeneous catalyst. The nanomaterial was fully characterized using various techniques such as Fourier‐transform infrared spectroscopy, scanning electron microscopy, trans...
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In this research, design and synthesis of the magnetic nanoparticle, coated by a silica shell and modified with dicationic ionic liquid are described. The characterization of Fe3O4@SiO2 ⋅ DIL was done by means of techniques such as XRD, FTIR, SEM, EDX, TEM, and TGA. The catalytic activity of Fe3O4@SiO2 ⋅ DIL as a new nanocatalyst was tested in the...
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In this work, the nanocatalyst of g-C 3 N 4 @L-arginine was prepared that synthesis of it in comparison with the synthesis of other catalysts was convenient; initially, this prepared nanocatalyst was evaluated and verified by FT-IR, EDX, XRD, TGA, and FESEM analysis, and in the next step, the performance of nanocatalyst in the synthesis of 1, 4-dih...
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Citations
... [24][25][26][27][28][29][30][31][32][33] Besides these above techniques, Bronsted acids, Lewis acids, and basic catalysts have also been used with limited success. [34][35][36][37][38][39][40][41][42][43][44][45][46][47][48][49][50] In addition to the aforementioned catalysts, heterogeneous catalysts as well as ionic liquids have also been used. [51][52][53][54][55][56][57][58][59][60][61][62] The majority of these protocols had some limitations such as protracted reaction times, formation of inevitable side products, low yields, tedious workup, etc. ...
2‐Amino‐3,5‐dicarbonitrile‐6‐phenylsulfanylpyridines occupy a prominent place among the physiologically and biologically active scaffolds owing to their therapeutic applications in the treatment of Parkinson's disease, asthma, urinary incontinence, kidney disease, the Hepatitis B infections, Creutzfeldt–Jacob disease, cancer, hypoxia/ischemia and epilepsy. A one‐pot, multicomponent condensation of aldehydes, malononitrile, and thiophenol catalyzed by Montmorillonite K10 clay afforded 2‐amino‐3,5‐dicarbonitrile‐6‐phenylsulfanylpyridines in good to excellent yields. All the products could be well characterized on the basis of spectral studies. The catalyst could be recycled three times without affecting the yields and even in the fourth recycling of the catalyst, the yield decreases marginally. This approach manifests environmentally benign feasibility in contexts of enhanced yields, milder conditions, short reaction times, and reusability of the catalyst. A theoretical study of a synthesized compound at the B3LYP/6–31 + G (d) level is additionally reported. Following the computation of the fundamental vibrational wavenumbers and intensities, it became evident that the observed and calculated wavenumbers were in perfect accord. Employing the same DFT level, Frontier molecular orbital (HOMO‐LUMO) energies, global reactivity descriptors, and molecular electrostatic potential were estimated for assessing the reactivity and possible sites for electrophilic and nucleophilic molecules. The outcomes prove that the compound exhibits significant kinetic stability.
... The use of fine particles in heterogeneous catalysts reduces the volume of the catalyst and allows the optimal use of the active component. The researchers aim to produce catalysts with high activity and yield, full selectivity, the ability to separate and recover from the reaction mixture, low energy consumption and long life (Ebrahimiasl, 2020;Mahmoudiani, 2021;Ebrahimiasl, 2021;Balali, 2021). ...
A Pd(II) Schiff base complex as an efficient and highly heterogeneous catalyst was developed by immobilization of a palladium complex on the surface of modified Fe3O4 magnetite nanoparticles. These surface-modified nanoparticles were characterized using various techniques such asSEM, TEM, XRD, FT-IR, EDX and VSM. The palladium catalyst exhibited efficient catalytic activity in Suzuki-Miura coupling reactions. This method has notable advantages such as excellent chemoselectivity, mild reaction conditions, short reaction times and excellent yields. The yields of the products were in the range 75-85%. Also, the nanocatalyst can be easily recovered with a permanent magnet and reused at least five times without noticeable leaching or loss of its catalytic activity. The products obtained from the coupling reaction were first examined by TLC techniques and after confirmation were identified by FT-IR& NMR techniques.
... However, these methods suffered from prolonged reaction times and poor yields. Apart from these, Bronsted, Lewis acids and basic catalysts have also been used with limited success [34][35][36][37][38][39][40][41][42][43][44][45][46][47][48][49][50]. ...
2-Amino-3,5-dicarbonitrile-6-thiopyridines occupy a prominent place among the physiologically and biologically active scaffolds owing to their therapeutic applications in the treatment of Parkinson’s disease, asthma, urinary incontinence, kidney disease, the Hepatitis B Foundation infections, Creutzfeldt–Jacob disease, cancer, hypoxia / ischemia and epilepsy. A one-pot, multicomponent condensation of aldehydes, malononitrile and thiophenol catalyzed by Montmorillonite K-10 clay afforded 2-amino-3,5-dicarbonitrile-6-thiopyridines in good to excellent yields. All the products could be well characterized on the basis of spectral studies. The catalyst could be recycled three times without affecting the yields and even in the fourth recycling of the catalyst, the yield decreases marginally. This approach manifests environmentally benign feasibility in contexts of enhanced yields, milder conditions, short reaction times and reusability of the catalyst.
... In this multicomponent pathway, water is only produced as the by-product. In addition, it possesses a chiral center at the phenylsubstituted carbon that can have signi cant stereochemical utilities [52][53][54]. Recently, chromenes and their derivatives have received great attention due to a broad spectrum of biological and pharmacological activities. In addition, some of these scaffolds construct the backbone of a wide range of natural products [55][56]. ...
An efficient and heterogeneous novel Dy complex of balsalazide, trapped between the functionalized halloysite and g -C 3 N 4 , was successfully synthesized by post-synthetic modification approach (Dy@Hal-BS- g -C 3 N 4 ). It was characterized by several advanced analytical methods including, FT-IR, SEM, EDX, elemental mapping, XRD, ICP-OES and TGA. The as-synthesized material was catalytically explored as a novel recoverable nanocatalyst in the synthesis of an array of biologically active pyran derivatives, i.e., the 2-amino-5,10-dioxo-4-aryl-5,10-dihydro-4H-benzo[ g ]chromene-3-carbonitriles. Excellent yields of the desired products and facile reusability of the catalyst are the two advantageous factors in the introduction of this novel catalytic system.
... The additional peaks present in the region 1500-1632 cm -1 in the FTIR spectra of Fe 3 O 4 @SB correspond to C--O, C--N, and C-C bonds. The peak corresponding to the C--O group in SB shifts downfield (1677 cm − 1 (Free SB) to 1632 cm − 1 (Fe 3 O 4 @SB)) upon functionalization which indicates the interaction of C--O group of Schiff base with the OH groups present on the surface of Fe 3 O 4 nanoparticles [11]. Upon complexation between Fe 3 O 4 @SB and (CH 3 ) 2 SnO, additional peaks at 1401 and 1112 cm − 1 were observed, corresponding to CH stretching. ...
The present study aims to control the particle size and morphology by surface modification of Fe3O4nanoparticles for the best use in catalytic performance. Fe3O4nanoparticles were coated with Schiff base and post modified with dimethyl-tin moiety to yield Fe3O4@[email protected] magnetic nanoparticles. The fully characterized nanoparticles were employed as a catalyst for the oxidation of anthracene (AN) to 9,10-anthraquinone (AQ). Experimental results indicated that the Fe3O4@[email protected] catalyst exhibits better catalytic activity and recyclability when acetonitrile was used as a solvent and H2O2as an oxidant at 70 °C.
We prepared a novel palladium (Pd) catalyst by loading palladium chloride onto novel functionalized multi-wall carbon nanotubes (MWCNTs). The Pd( ii )/MWCNT complex efficiently and selectively catalyzed large-scale synthesis of target molecules with high yield and large turnover numbers.
