Nano-Fe3O4 -encapsulated silica particles bearing sulfonic acid groups as a magnetically separable catalyst for the green and efficient synthesis of 14-aryl-14H-dibenzo[a,i]xanthene-8,13-dione derivatives

Ghasemzadeh, Mohammad Ali; Azimi-Nasrabad, Mina

doi:10.1007/s11164-015-2073-7

Cited by 19 publications

(5 citation statements)

References 42 publications

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“…FTIR spectra of SiO 2 −SO 3 H microspheres show two characteristic adsorption bands at 3450.50 and 1634.91 cm −1 related to the O−H stretching and bending vibrations of the SO−H bond of the sulfonic acid groups (SO 3 H). 23 The FTIR spectra of SiO 2 − SO 3 H microspheres at 3354 and 1609 cm −1 are significantly larger than those of SiO 2 ; this is due to the enhancement of the characteristic peak due to the coincidence of the SO−H stretching and bending vibration with the O−H stretching peak and the sulfonic acid group. 24 2.1.2.…”

Section: Resultsmentioning

confidence: 97%

Green Conversion of Saponins to Diosgenin in an Alcoholysis System Catalyzed by Solid Acid Derived from Phosphorus Tailings

Shen

Jiang

et al. 2021

ACS Omega

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This work proposed to prepare solid acid from phosphorus tailings and successfully convert Dioscorea zingiberensis C.H. Wright (DZW) into diosgenin from the perspective of solid waste resource reuse and clean production. The results showed that SiO 2 −SO 3 H solid acid could catalyze the production of diosgenin from total saponins under solvothermal reaction conditions. In addition, the parameters of a single factor, such as the amount of SiO 2 −SO 3 H, solvent volume, reaction temperature, and reaction time, were optimized to confirm the optimal range of reaction conditions, and the optimal process conditions were determined by the response surface method. The yield of diosgenin was 2.45 ± 0.17% under the optimum conditions, and the yield of diosgenin was increased by 12.90% compared with the traditional acid hydrolysis process. Except the relatively higher catalytic activity, the alcoholysis approach for the production of diosgenin has no waste liquid to discharge. The products were analyzed by highperformance liquid chromatography-mass spectrometry, and the pathway to convert total saponins into diosgenin under SiO 2 − SO 3 H has been proposed. Moreover, the adopted catalyst can be prepared with very low cost from phosphorus tailings. Considering the obvious superiorities, the alcoholysis approach in this work could be a promising strategy for green production of diosgenin as well as a possible utilization pathway of phosphorus tailings.

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Section: Resultsmentioning

confidence: 97%

Green Conversion of Saponins to Diosgenin in an Alcoholysis System Catalyzed by Solid Acid Derived from Phosphorus Tailings

Shen

Jiang

et al. 2021

ACS Omega

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“…In this article, the preparation and silylation of ferrite nanoparticles are depicted diagrammatically but have not been explained in detail to avoid repetition of material in most of the methods of preparation of the nano-catalysts. 58,59…”

Section: Importance Of Organo-nanocatalysismentioning

confidence: 99%

Recent advances in organo-nanocatalysis in the field of green organic synthesis

Rahman¹,

Nongkhlaw²

2019

Arkivoc

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This article presents a summary of the uses of the various organo-nanocatalysts in organic synthesis that have been reported in the literature. A key feature of the development of sustainable methodology in organic synthesis is the easy recovery of a valuable catalyst and its reuse in successive runs without appreciable loss in its efficiency. Progress in the synthetic approaches to magnetic organo-nanocatalysts and their applications in organic synthesis are covered.

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“…In the context of multifunctional catalysts for heterogeneous modification applications, it is imperative to investigate the activity of coordinated cholines on the magnetic surface. Considering the magnetic attraction and potential for agglomeration, incorporating coating stabilizers becomes necessary [ 37 , 38 ]. The MgO shell acts as a shield for magnetic nanoparticles, preventing further oxidation and aggregation of the magnetic core.…”

Section: Introductionmentioning

confidence: 99%

Modified nano magnetic Fe2O3-MgO as a high active multifunctional heterogeneous catalyst for environmentally beneficial carbon–carbon synthesis

Kamali,

Dreekvandy,

Mohammadkhani

et al. 2024

BMC Chemistry

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In this study, novel nanomagnetic catalysts, namely Fe2O3-MgO@choline formate (Ch. F.) and Fe2O3-MgO@choline cyanide (Ch. CN), were synthesized through immobilizing choline-based ion liquids to magnetic support via a simple and cost-effective methodology. FT-IR, TGA, FE-SEM, VSM, EDS, BET, and XRD techniques were employed to assess and characterize these organic–inorganic compounds. Following the successful preparation of nanoparticles, the catalysts were utilized in Knoevenagel and benzoin condensations. Fe2O3-MgO@Ch.F. exhibited exceptional activity in Knoevenagel condensation under solvent-free conditions at room temperature, achieving high yields (91–98%) in a short timeframe. Similarly, Fe2O3-MgO@Ch.CN demonstrated remarkable activity in benzoin condensation under environmentally friendly solvent conditions, yielding higher isolated yields (76–88%). Furthermore, these magnetically recyclable multifunctional catalysts displayed the ability to be reused up to five times without a significant loss in efficiency. Additionally, the heterogeneity of this nanocatalyst was investigated using the hot filtration technique. The findings indicated that the reaction primarily occurs via a heterogeneous pathway.

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Nano-Fe3O4 -encapsulated silica particles bearing sulfonic acid groups as a magnetically separable catalyst for the green and efficient synthesis of 14-aryl-14H-dibenzo[a,i]xanthene-8,13-dione derivatives

Cited by 19 publications

References 42 publications

Green Conversion of Saponins to Diosgenin in an Alcoholysis System Catalyzed by Solid Acid Derived from Phosphorus Tailings

Green Conversion of Saponins to Diosgenin in an Alcoholysis System Catalyzed by Solid Acid Derived from Phosphorus Tailings

Recent advances in organo-nanocatalysis in the field of green organic synthesis

Modified nano magnetic Fe2O3-MgO as a high active multifunctional heterogeneous catalyst for environmentally beneficial carbon–carbon synthesis

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