Magnetic nanoparticles supported bromine sources: Catalysis in organic synthesis

Ghobadi, Massoud; Qhazvini, Peiman Pourmoghaddam; Eslami, Mohammad; Kazemi, Mosstafa

doi:10.1080/00397911.2020.1829646

Cited by 9 publications

(7 citation statements)

References 104 publications

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“…Magnetic nanocatalysts can be quickly extracted from the reaction medium using an external magnet, without a need for more filtration, centrifugation, or other time-consuming methods 7 . Magnetic nanoparticles (MNPs) have a number of superior properties, including high surface area to bulk ratios, low toxicity, high activity, thermal stability, surface modification, and dispersibility 7 – 10 . As a result, they are more appropriate catalysts or supports and more sustainable than ordinary samples 11 .…”

Section: Introductionmentioning

confidence: 99%

Promising photocatalytic and antimicrobial activity of novel capsaicin coated cobalt ferrite nanocatalyst

El‐Khawaga

El-Sayed

Fahim³

et al. 2023

Sci Rep

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In this study, CoFe2O4 nanoparticles were prepared by the co-precipitation method then surface modified with Capsaicin (Capsicum annuum ssp.). The virgin CoFe2O4 NPs and Capsaicin-coated CoFe2O4 NPs (CPCF NPs) were characterized by XRD, FTIR, SEM, and TEM. The antimicrobial potential and photocatalytic degradation efficiencies of the prepared samples via Fuchsine basic (FB) were investigated. The results revealed that CoFe2O4 NPs have spherical shapes and their diameter varied from 18.0 to 30.0 nm with an average particle size of 25.0 nm. Antimicrobial activity was tested on Gram-positive (S. aureusATCC 52923) and Gram-negative (E. coli ATCC 52922) by disk diffusion and broth dilution methods to determine the zone of inhibition (ZOI) and minimum inhibitory concentration (MIC), respectively. UV-assisted photocatalytic degradation of FB was examined. Various parameters affecting the photocatalytic efficiency such as pH, initial concentration of FB, and dose of nanocatalyst were studied. The in-vitro ZOI and MIC results verified that CPCF NPs were more active upon Gram-Positive S. aureus ATCC 52923 (23.0 mm ZOI and 0.625 μg/ml MIC) than Gram-Negative E. coli ATCC 52922 (17.0 mm ZOI and 1.250 μg/ml MIC). Results obtained from the photocatalytic activity indicated that the maximum FB removal achieving 94.6% in equilibrium was observed using 20.0 mg of CPCF NPS at pH 9.0. The synthesized CPCF NPs were effective in the removal of FB and also as potent antimicrobial agent against both Gram-positive and Gram-negative bacteria with potential medical and environmental applications.

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Section: Introductionmentioning

confidence: 99%

Promising photocatalytic and antimicrobial activity of novel capsaicin coated cobalt ferrite nanocatalyst

El‐Khawaga

El-Sayed

Fahim³

et al. 2023

Sci Rep

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“…Magnetic nanoparticles, in particular, have emerged as captivating entities with myriad applications across various domains [5,6] . The magnetic allure lies in their water solubility and inherent magnetism, enabling facile separation from reaction mixtures using a magnet [7,8] . Recent decades have witnessed the ascendancy of separation technology, harnessing the prowess of functional magnetic materials in chemical synthesis [9,10] .…”

Section: Introductionmentioning

confidence: 99%

One–Pot Three–Component Synthesis of 2,4,5–Triaryl Imidazoles using Fe3O4@BisImid−CuBr Nanocomposite as an Ecofriendly and Efficient Magnetically Reusable Catalyst

Al‐Dolaimy,

Alsalamy,

Abdullah Abbas

et al. 2024

ChemistrySelect

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Imidazoles are one of the keys of N‐heterocycle molecules that exist in the structure of many biomolecules. In this research project, we reported that Fe3O4@BisImid−CuBr nanocomposite is an attractive and efficient nanomagnetic catalyst to afford 2,4,5–triaryl imidazoles through reactions of 1,2–diketones and aldehydes in the presence of NH4OAc under ecofriendly conditions. The Fe3O4@BisImid−CuBr nanocomposite was readily fabricated by a simple method from available reagents and its structure was analyzed by spectroscopic techniques. SEM and TEM images affirmed the formation of particles in spherical shape and nanometer–size. Under this methodology, a diverse library of triaryl imidazoles were afforded with high yields in water. This synthetic methodology has significant features such as (a) high yields and high purity of the products (b) suitable reaction time (c) use of magnetic reusable nanocatalyst (d) high reusability of Fe3O4@BisImid−CuBr nanocatalyst and the performance of reactions in aqueous medium.

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“…In recent years, much attention has been paid to Br 3 − immobilized on polymers, 1,17 magnetic nanoparticles (MNP) 16,[18][19][20][21][22][23] and other solid supports. 24 The organic tribromide immobilized on magnetic nanoparticles can be easily separated from the reaction mixture using an external magnet without the need for filtration or other workup processes.…”

Section: Introductionmentioning

confidence: 99%

“…This can solve the problems associated with nanoparticle separation. 25,26 Although several immobilized tribromides have been synthesized, in most cases their preparation involves the use of liquid Br 2 and/or HBr, 16,[21][22][23][24] which leads to an environmental problem. Numerous improved methods for the synthesis of organic tribromides have been described in the literature and are considered to be environmentally friendly.…”

Section: Introductionmentioning

confidence: 99%

“…Numerous improved methods for the synthesis of organic tribromides have been described in the literature and are considered to be environmentally friendly. These improved methods use an oxidation system for the oxida- 28 Despite the introduction of these oxidation methods in the literature, many of the recently reported methods for the synthesis of magnetic nanoparticles (MNP) 16,[21][22][23] or polymer-assisted 1,17 bromine sources involve liquid Br 2 and/or HBr, which continues to cause environmental problems. Therefore, the development of newer strategies that do not require the use of molecular bromine or metals and strong mineral acids remains a challenge for the synthesis of immobilized organic tribromides, especially nanoparticle-based magnetic catalysts.…”

Section: Introductionmentioning

confidence: 99%

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Magnetic Nanoparticles Linked to Pyridinium Hydrotribromide Groups as Catalysts for Selective Oxidation of Alcohols and Protection of Alcohols

Tabari

Pourali

Zare

2022

ACSi

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In this research, a novel magnetic nanocatalyst based on iron oxide nanoparticles linked with pyridinium hydrotribromide (Fe3O4@PyHBr3) was synthesized in three steps. In the first step, 3-(aminopropyl)triethoxysilane (APTES) was reacted with 4-(bromomethyl)pyridine hydrobromide. In the second step, the product obtained in the first step was reacted with iron oxide nanoparticles. In the last step, a grinding reaction was carried out with KBr and HIO4 in a mortar. The Fe3O4@PyHBr3 nanocatalyst was characterized by FT-IR, CHN, XRD, SEM, TGA and VSM analysis. The magnetic nanocatalyst was used as a catalyst for the selective oxidation of alcohols to aldehydes and ketones using 30% H2O2 as oxidant in a short time and with high yields. Moreover, no overoxidation of the alcohols was observed. The nanocatalyst was efficiently recycled in five consecutive cycles without significant loss of its catalytic activity. Moreover, trimethylsilylation and tetrahydropyranylation of alcohols were carried out in the presence of this nanocatalyst.

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Magnetic nanoparticles supported bromine sources: Catalysis in organic synthesis

Cited by 9 publications

References 104 publications

Promising photocatalytic and antimicrobial activity of novel capsaicin coated cobalt ferrite nanocatalyst

Promising photocatalytic and antimicrobial activity of novel capsaicin coated cobalt ferrite nanocatalyst

One–Pot Three–Component Synthesis of 2,4,5–Triaryl Imidazoles using Fe3O4@BisImid−CuBr Nanocomposite as an Ecofriendly and Efficient Magnetically Reusable Catalyst

Magnetic Nanoparticles Linked to Pyridinium Hydrotribromide Groups as Catalysts for Selective Oxidation of Alcohols and Protection of Alcohols

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