Wrinkled fibrous nanosilica (WFNS) which functionalized by ionic liquid modified Fe3O4 NPs and CuI salts has been synthesized and characterized with FE-SEM, TEM, FT-IR, FAAS, EDX, and, XRD, VSM, and ...BET-BJH analysis. This new and effective magnetic ceramic nanocatalyst has been applied towards rapid synthesis of N-sulfonylamidines using reaction of phenyl acetylene, substituted sulfonyl azide and various amines under solvent-free conditions in very short reaction time. Higher catalytic activity CuI/Fe3O4NPs@IL-DFNS in the reaction is because of special structure of DFNS and existence of ionic liquids on its pores which act as a robust anchors to the loaded various nano-particles. So, this lead to no leaching of them from the pore of the composite. Shorter reaction time, higher yield, recovery of the catalyst using an external magnet and its reusability for 8 series without noteworthy reduction in its activity are the advantages of newly synthetic catalyst toward efficient synthesis of N-sulfonylamidines.
Wrinkled fibrous nanosilica, Ceramic nanocatalyst, Advanced nanomaterials, N-sulfonylamidines.
The aim of the present study was to evaluate the H
2
O
2
scavenging activity of the ZnO
2
/β-CD as a biocompatible composite. Zinc peroxide was prepared via sonochemical approach. To synthesize a ...green composite, β-cyclodextrin was modified by citric acid (CA) and reacted with ZnO
2
under ultrasonic irradiation. The prepared samples were characterized using XRD, SEM, TGA and FTIR analytical techniques. XRD analysis exhibited a typical pattern of ZnO
2
and demonstrated the presence of citric acid and β-cyclodextrin in composite. The results of the catalytic assay showed that the ZnO
2
/CA-βCD composite displayed stronger capability to decompose H
2
O
2
in comparison to ZnO
2
particles (about seven times). It was attributed to increased adsorption capacity and solubility of composite due to the presence of citric acid and β-cyclodextrin. MTT assay studies confirmed the non-cytotoxic nature of ZnO
2
particles and ZnO
2
/CA-βCD composite.
Graphic abstract
Iron was incorporated into MCM-41 via direct synthesis and wet impregnation methods. Removal of the surfactant occluded in Fe/MCM-41 pores has been performed by using two procedures: solvent ...extraction and calcination. For comparison, a series of template-containing mesoporous Fe/MCM-41 were also synthesized without surfactant removal. The catalysts were examined in three component reaction to afford benzoxanthene derivative. A high yield of 91% was achieved over template-containing Fe/MCM-41 catalyst. This high activity is due to both lewis acid sites and ionic template. This catalyst could be easily recovered by filtration and reused without loss of its catalytic activity because the organic template does not leach during the reaction. It is also very efficient for the synthesis of a hydroxanthene derivative.
KCC-1/Pr-SO3H is found to be a considerable efficient nanocatalyst for the one-pot three-component condensation coupling of aromatic aldehydes, isatoic anhydride, and primary amines for the synthesis ...of 2,3-dihydroquinazolin-4(1H)-ones in ethanol as a green solvent under reflux conditions with excellent yields. The influence of different reaction parameters such as the effects of solvent, temperature, time, and concentration of catalyst for the synthesis of 2,3-dihydroquinazolin-4(1H)-one (4f) were studied. KCC-1/Pr-SO3H is easily recyclable without the significant loss of catalytic activities after seven times. This mild and simple synthesis method offers some worthwhile advantages including short reaction time, high yield, and convenient work-up procedure.
The three-component Hantzsch condensation of various aryl aldehydes, dimedone, and methyl 3-aminocrotonate was investigated in the presence of MCM-41-supported ZnNO
3
. The polyhydroquinoline ...products which were obtained under mild conditions and very easy workup were evaluated for anti-cancer activities against MCF-7, SK-BR-3, and HT-29 of breast and colon cancer cells. The fluorescence emission of some products was also studied and their optical parameters were reported.
Graphic abstract
In this study, a novel approach has been used for the efficient synthesis of tetrahydrodipyrazolopyridine derivatives (5a-m) via a four-component one-pot condensation reaction of aromatic aldehydes, ...hydrazinehydrate, ethyl acetoacetate, and ammonium acetate in the presence of KCC-1-npr-NH
2
-DPA as an advanced nano-catalyst in ethanol under reflux conditions at 30 min. For this purpose, mesoporous fibrous nano-silica functionalized by dipenicillamine as a novel nanocatalyst (KCC-1-npr-NH
2
-DPA) was synthesized using a hydrothermal protocol. KCC-1-npr-NH
2
-DPA nano-catalyst is easily recyclable eight times without the considerable loss of catalytic activity. Other remarkable features include the short reaction time, simple work-up procedure and providing excellent yields (89-98%) of the products under mild reaction conditions. Furthermore, the effects of solvent, concentration of catalyst, time and temperature for the synthesis of tetrahydrodipyrazolopyridine (5a) were studied.
In this study, paramagnetic dendritic fibrous nano‐silica functionalized by aminopropyltriethoxysilan (Fe3O4@KCC‐1‐nPr‐NH2) was synthesized using a novel hydrothermal protocol and used as a highly ...efficient, recyclable and heterogeneous nanocatalyst for the synthesis of a wide range of tetrahydrodipyrazolopyridines derivatives (5a‐5 m). The influence of different reaction parameters, such as the effects of solvent, temperature, time and concentration of catalyst for the synthesis of tetrahydrodipyrazolopyridine (2a) were studied. This catalyst could be reused for ten consecutive recycles without any considerable loss in its catalytic activity. This novel synthesis method offers some advantages including short reaction time, high yield and simple work‐up procedure. Finally, the newly synthesized tetrahydrodipyrazolopyridines derivatives (5a‐5f) were characterized by 1H and 13C NMR, IR and CHN.
Fe3O4@KCC‐1‐nPr‐NH2 was synthesized using a novel hydrothermal protocol and used as a highlyefficient, recyclable and heterogeneous nanocatalyst for the synthesis of awide range of tetrahydrodipyrazolopyridines derivatives
More studies in estimating rainfall variations have focused on examining the change in the series' mean/median, which does not lead to the analysis of wet and dry conditions. Variations in wet and ...dry years, equivalent to changes in the upper and lower quantiles, have critical effects on human, environmental, and ecological activities. This study investigated variations in wet and dry years compared to the normal years in Iran using long-term data (1966–2019) from 41 synoptic stations. The Bayesian quantile regression model was used to study variations in annual rainfall quantiles. In addition, the spatial-temporal distribution of variations was analyzed. The results reveal that the intensities of wet years (Q90) variations are significantly higher than dry years (Q10) and normal years (Q50). In addition, wet and dry years show decreasing and increasing behaviors in most parts of Iran. Wet and dry years variations in the western, north-western, and northern regions of Iran have been more severe than the rest of the country. Moreover, the results reveal that disregarding variations in wet and dry years can lead to inappropriate inferences about water-related activities.
•Variations in wet and dry years in Iran were investigated using long-term data sets.•Intensities of variations in wet years are significantly higher than in dry years.•In most parts of Iran, wet and dry years show decreasing and increasing behaviors.•Variations are severe in Iran's western, northwestern, and northern regions.
A new magnetic nanocatalyst (Fe3O4@KCC‐1‐npr‐NH2) was synthesized directly through the reaction of Fe3O4@KCC‐1 with (3‐aminopropyl) triethoxysilane (APTES) using a hydrothermal protocol. Prepared ...nanocomposite was used as a magnetically reusable nanocatalyst for an efficient synthesis of a broad range of sulfonamide derivatives in water as a green solvent at room temperature and the products are collected by filtration with excellent yields (85–97%). The nanocatalyst could be remarkably recovered and reused after ten times without any significant decrease in activity. This mild and simple synthesis method offers some advantages including short reaction time, high yield and simple work‐up procedure.
A new magnetic nanocatalyst (Fe3O4@KCC‐1‐npr‐NH2) was synthesized directly through the reaction of Fe3O4@KCC‐1 with (3‐aminopropyl) triethoxysilane (APTES) using ahydrothermal protocol. Prepared nanocomposite was used as a magneticallyreusable nanocatalyst for an efficient synthesis of a broad range ofsulfonamide derivatives in water as a green solvent at room temperature and theproducts are collected by filtration with excellent yields(85‐97%).
In the present work, an innovative leach proof nanocatalyst based on dendritic fibrous nanosilica (DFNS) modified with ionic liquid loaded Fe3O4 NPs and CuI salts was designed and applied for the ...rapid synthesis of imidazo1,2‐apyridines from the reaction of phenyl acetylene, 2‐aminopyridine, and aldehydes in aqueous medium. The structure of the synthesized nanocatalyst was studied by field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), Fourier transform infrared (FT‐IR), flame atomic absorption spectroscopy (FAAS), energy‐dispersive X‐ray (EDX), and X‐ray diffraction (XRD), vapor–liquid–solid (VLS), and adsorption/desorption analysis (Brunauer–Emmett–Teller BET equation) instrumental techniques. CuI/Fe3O4NPs@IL‐KCC‐1 with high surface area (225 m2 g−1) and porous structure not only exhibited excellent catalytic activity in aqueous media but also, with its good stability, simply recovered by an external magnet and recycled for eight cycles without significant loss in its intrinsic activity. Higher catalytic activity of CuI/Fe3O4NPs@IL‐KCC‐1 is due to exceptional dendritic fibrous structure of KCC‐1 and the ionic liquid groups that perform as strong anchors to the loaded magnetic nanoparticles (MNPs) and avoid leaching them from the pore of the nanocatalyst. Green reaction media, shorter reaction times, higher yields (71–97%), easy workup, and no need to use the chromatographic column are the advantages of the reported synthetic method.
An innovative leach proof nanocatalyst based on dendritic fibrous nanosilica (DFNS) modified with ionic liquid loaded Fe3O4 NPs and CuI salts was designed and applied for the rapid synthesis of imidazo1,2‐apyridines from the reaction of phenyl acetylene, 2‐amino pyridine, and aldehydes in aqueous medium.
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