In situ preparation of CeO2 nanoparticles on the MCM-41 with magnetic core as a novel and efficient catalyst for the synthesis of substituted pyran derivatives

Saadati-Moshtaghin, Hamid Reza; Zonoz, Farrokhzad Mohammadi

doi:10.1016/j.inoche.2018.11.010

Cited by 13 publications

(6 citation statements)

References 44 publications

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“…Moshtaghin et al [162] have reported solvent-free, one-pot, synthesis of tetrahydrobenzo[b]pyrans using CeO 2 /MCM-41@Fe 3 O 4 magnetic nanocomposite as a solid acid catalyst (Figure 97). Electron-deficient aromatic aldehydes give higher yields because of higher electrophilicity of the carbonyl carbon.…”

Section: Multicomponent Reactionsmentioning

confidence: 99%

Functionalized MCM‐41: Versatile Catalysts for Organic Transformations

et al. 2022

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Functionalized MCM-41 constitute a group of potent hybrid catalysts for organic reactions. Their pore size is large enough to house large substrate molecules, the large bulk of surface silanol groups helps in introduction of a variety of functionalities required for the catalytic action. The current review emphasizes the broad methodology for the synthesis of these catalysts, effect of functionalization on reaction parameters, stability, efficiency, selectivity, reusability along with limitations of these catalysts to organic transformations, from a green chemistry standpoint. Some selected mechanisms of catalytic action are also highlighted. The review demonstrates that surface functionalized MCM-41 constitute innovative and need based catalyst systems that catalyze reactions like Sonogashira, Suzuki, Heck, Friedel Craft reaction, Aldol and Knoevenagel condensation etc. Several other reactions like oxidation, reduction, dehydration, esterification, epoxidation, CÀ S, CÀ N, CÀ O and SÀ S coupling as well as multicomponent synthesis of bioactive heterocycles have also been reported. It is hoped that this review will improve the understanding of scientific community on how these versatile catalysts operate and will provide opportunities to further enhance their utility for chemical industry.

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Section: Multicomponent Reactionsmentioning

confidence: 99%

Functionalized MCM‐41: Versatile Catalysts for Organic Transformations

et al. 2022

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“…31,32 The various catalysts used for the synthesis of these compounds include diammonium hydrogen phosphate, tetra butyl ammonium bromide, L-Proline, ionic liquids, titanium dioxide, magnesium oxide, nano zinc oxide, silica coated magnetic polyoxometalate, etc. [33][34][35][36] However, there are some limitations associated with the synthesis of pyran by these catalysts such as the use of toxic and corrosive reagents, poor environmental safety and tedious work-up procedures in addition to the use of highly reactive acidic catalysts. Thus, finding a new catalyst with minimal corrosion, easy recovery, high efficacy and reusability would be highly desirable.…”

Section: Introductionmentioning

confidence: 99%

Oxygen vacancy enhanced catalytic activity in a Pt nanoparticle decorated GO–Ce_xO_ycatalyst for the efficient synthesis of pyran based derivatives

et al. 2023

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“…Supported noble metals, including Pt, Ru, and Rh, are widely studied because they are well known to be potent catalysts in the hydrogenolysis of glycerol. , Such catalysts, unfortunately, often encourage excessive C–C cleavage, which has a negative impact on propanediol selectivity. Due to their low C–C bond cleavage activity and copper-based catalysts, high C–O bond hydro-dehydrogenation efficiency has been proven to be better than more costly alternatives in this process. , Utilizing biomass-derived chemical feedstocks to create marketable compounds through the catalytic transformation of renewable resources (used as alternatives to fossil fuels and fine chemicals) is a global problem . It has also been investigated how to etherify glycerol using isobutene using an acid exchange resin catalyst.…”

Section: Introductionmentioning

confidence: 99%

Comparative Surface Study of Ru/Cu- and Ag/Cu-Doped RHS Catalysts from Waste Biomass for Biofuel Application

et al. 2023

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The present study compares the surface, textural, and catalytic properties of porous silica doped with bimetallic metal ions that was made from rice husk (RH) biomass. Due to the use of a surfactant during the synthesis process, porous RH-silica (RHS) was derived. In situ doping of silver/copper and ruthenium/copper has been achieved via the xerogel and hydrogel formation methods. The prepared catalysts have been analyzed by various methods, such as surface area and narrow pore size distribution, to confirm their porosity. Powder Xray diffraction, Fourier transform infrared, and electron microscopy examination were further performed for physicochemical characterization of the synthesized materials. Transmission electron microscopy images showed that ruthenium and copper ions were incorporated perfectly, forming a hexagonal mesoporous (MCM-41) texture due to hydrogel formation and the method of preparation. Copper oxide nanoparticles with silver incorporation in RHS form cube-shaped particles for CuO formation on the surface of the silica matrix instead due to the method of preparation. In this case, ruthenium/copper-doped porous silica forms hexagon-shaped particles of RuO formation in the mesoporous matrix. Finally, the acetylation of glycerol using acetic acid on as-prepared catalysts has been studied. The catalytic activity increases with an increase in temperature and optimization of the molar ratio of glycerol and acetic acid. Increases in temperature result in higher selectivity toward triacetin formation instead of the conventional formation of monoacetin. Hence, we compared the surface physicochemical properties, catalytic conversion, and selectivity nature of bimetallic metal (Ru/Cu and Ag/Cu) ions incorporated in RHS prepared by different synthetic routes.

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In situ preparation of CeO2 nanoparticles on the MCM-41 with magnetic core as a novel and efficient catalyst for the synthesis of substituted pyran derivatives

Cited by 13 publications

References 44 publications

Functionalized MCM‐41: Versatile Catalysts for Organic Transformations

Functionalized MCM‐41: Versatile Catalysts for Organic Transformations

Oxygen vacancy enhanced catalytic activity in a Pt nanoparticle decorated GO–Ce_xO_ycatalyst for the efficient synthesis of pyran based derivatives

Comparative Surface Study of Ru/Cu- and Ag/Cu-Doped RHS Catalysts from Waste Biomass for Biofuel Application

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In situ preparation of CeO2 nanoparticles on the MCM-41 with magnetic core as a novel and efficient catalyst for the synthesis of substituted pyran derivatives

Cited by 13 publications

References 44 publications

Functionalized MCM‐41: Versatile Catalysts for Organic Transformations

Functionalized MCM‐41: Versatile Catalysts for Organic Transformations

Oxygen vacancy enhanced catalytic activity in a Pt nanoparticle decorated GO–CexOycatalyst for the efficient synthesis of pyran based derivatives

Comparative Surface Study of Ru/Cu- and Ag/Cu-Doped RHS Catalysts from Waste Biomass for Biofuel Application

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Oxygen vacancy enhanced catalytic activity in a Pt nanoparticle decorated GO–Ce_xO_ycatalyst for the efficient synthesis of pyran based derivatives