CoFe2O4–SiO2–SO3H nanocomposite as a magnetically recoverable catalyst for oxidative bromination of alkynes

Dutta, Mintu Maan; Rajbongshi, Kamal Krishna; Phukan, Prodeep

doi:10.1080/00397911.2017.1376333

Cited by 15 publications

(2 citation statements)

References 36 publications

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“…The weight loss appearing at 104.1°C was due to the removal of moisture and volatile components from the sample. [ 64 ] The weight loss observed at 241.1–270.5°C may be attributed to the decomposition of precursor salts, [ 65 ] while weight loss in the range of 330.4–340.5°C corresponds to the structural changes in CoFe 2 O 4 @SiO 2 nanoparticle. [ 66 ] Finally, at a temperature above 600°C, no appreciable weight loss was observed indicating the existence of CoFe 2 O 4 @SiO 2 nanoparticles.…”

Section: Resultsmentioning

confidence: 99%

Silica supported spinel structured cobalt ferrite multifunctional nanocatalyst for hydration of nitriles and oxidative decarboxylation of phenylacetic acids

Hazarika

Borah

2022

Applied Organom Chemis

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The silica‐supported cobalt ferrite spinel nanocatalyst has been successfully synthesized by the coprecipitation method and extensively characterized by FTIR, XRD, SEM‐EDX, TEM, BET, VSM, XPS, TGA, and ICP‐AES analysis. The bands observed at 3435 cm−1 (ν OH of Si‐OH) and 1637 cm−1 (γ OH of Si‐OH) in the FTIR spectrum of the as‐synthesized nanocatalyst unambiguously tell the presence of silica support. Moreover, a very weak intensity and a medium intensity peak at 683 cm−1 and 463 cm−1 suggested intrinsic stretching vibrations of Fe‐O and Co‐O of cobalt ferrite, respectively. The XRD pattern confirms the formation of CoFe2O4 spinel. The average crystallite size was found to be 5.4 nm as calculated by using the Debye–Scherrer equation based on the (220) plane while the average particle size was found to be 5.08 nm from TEM analysis. The crystalline nature of the nanocomposite was confirmed by the SAED pattern. The successful incorporation of CoFe2O4 on the surface of silica was established by the BET surface area measurements. The silica‐supported cobalt ferrite nanocatalyst has been explored as a heterogeneous multifunctional catalyst for hydration of nitriles and oxidative decarboxylation of phenylacetic acids as well under mild reaction conditions with moderate to excellent isolated yield of the desired products (60–99%). The catalyst was magnetically recoverable within a time frame of ~90 s and reusable up to the fifth catalytic cycle without profound loss of activity. A magnetic hysteresis study was performed to elucidate the magnetic behavior of the catalyst. The saturation magnetization value of 39.785 emu/g with a coercivity value of 110.87 Oe and saturation remanence value of 5.185 emu/g clearly indicated the presence of a ferromagnetic component in the material.

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Section: Resultsmentioning

confidence: 99%

Silica supported spinel structured cobalt ferrite multifunctional nanocatalyst for hydration of nitriles and oxidative decarboxylation of phenylacetic acids

Hazarika

Borah

2022

Applied Organom Chemis

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“…Usage of silica coating is beneficial due to its chemically inert nature and presence of active silanol groups on the surface of coated silica that can be readily functionalized by reacting with various coupling agents . Although ‐SO 3 H functionalized silica‐coated CoFe 2 O 4 nanoparticles have already been deployed as a magnetically separable catalyst by Phukan and co‐workers and Nguyen et al ., the synthesis of core–shell structured CoFe 2 O 4 @SiO 2 ‐SO 3 H nanocatalysts has yet to be explored since the synthesis of a core–shell nanostructure is still challenging.…”

Section: Introductionmentioning

confidence: 99%

Expeditious synthesis of diverse spiro fused quinoxaline derivatives using magnetically separable core–shell CoFe₂O₄@SiO₂‐SO₃H nanocatalyst under ultrasonication

Mandal

Hazra

Sarkar

et al. 2019

Applied Organom Chemis

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A magnetically separable core–shell CoFe2O4@SiO2‐SO3H nanocatalyst has been successfully exploited as a heterogeneous acid catalyst in the synthesis of diversely substituted biologically important spiro fused pyrrolo/indolo[1,2‐a]quinoxaline derivatives through the condensation of N‐(2‐aminophenyl)pyrroles/indoles and various cyclic conjugated 1,2‐diones in ethanol under ultrasonic irradiation. Room temperature synthesis, short reaction time, wide substrate scope, good to excellent yield of products and use of a magnetically separable and recyclable nanocatalyst make this method attractive and practicable.

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A Sustainable Synthesis of Functionalized Pyrrole Fused Coumarins under Solvent‐Free Conditions Using Magnetic Nanocatalyst and a New Route to Polyaromatic Indolocoumarins

2018

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A general and environmentally benign one‐pot method has been developed for the library synthesis of biologically important chromeno[4, 3‐b]pyrrol‐4(1H)‐one derivatives. A three‐component domino condensation of 4‐aminocoumrins, arylglyoxal monohydrates and various nucleophilic substrates, such as, arylamines, malononitrile, ethyl cyanoacetate and cyanoacetamide produced functionalized chromeno[4, 3‐b]pyrrol‐4(1H)‐ones in presence of magnetically separable Fe3O4@SiO2‐SO3H nanoparticles as solid acid catalyst under solvent free conditions. Furthermore, a two‐component condensation of 4‐aminocoumrins and arylglyoxal monohydrates furnished a series of hydroxy functionalized chromeno[4, 3‐b]pyrrol‐4(1H)‐ones under similar reaction conditions. The salient features of the present method are mild reaction conditions, reduced reaction time, elimination of hazardous solvents, good yield of the products, greater substrate scope and use of a magnetically separable and recyclable nanocatalyst. Moreover, it has been observed that a class of chromeno[4, 3‐b]pyrrol‐4(1H)‐one derivatives can be easily converted to biologically important indolo[3, 2‐c]coumarin derivatives in good yield through intramolecular thermal cyclization without using any catalyst.

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CoFe₂O₄–SiO₂–SO₃H nanocomposite as a magnetically recoverable catalyst for oxidative bromination of alkynes

Cited by 15 publications

References 36 publications

Silica supported spinel structured cobalt ferrite multifunctional nanocatalyst for hydration of nitriles and oxidative decarboxylation of phenylacetic acids

Silica supported spinel structured cobalt ferrite multifunctional nanocatalyst for hydration of nitriles and oxidative decarboxylation of phenylacetic acids

Expeditious synthesis of diverse spiro fused quinoxaline derivatives using magnetically separable core–shell CoFe₂O₄@SiO₂‐SO₃H nanocatalyst under ultrasonication

A Sustainable Synthesis of Functionalized Pyrrole Fused Coumarins under Solvent‐Free Conditions Using Magnetic Nanocatalyst and a New Route to Polyaromatic Indolocoumarins

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CoFe2O4–SiO2–SO3H nanocomposite as a magnetically recoverable catalyst for oxidative bromination of alkynes

Cited by 15 publications

References 36 publications

Silica supported spinel structured cobalt ferrite multifunctional nanocatalyst for hydration of nitriles and oxidative decarboxylation of phenylacetic acids

Silica supported spinel structured cobalt ferrite multifunctional nanocatalyst for hydration of nitriles and oxidative decarboxylation of phenylacetic acids

Expeditious synthesis of diverse spiro fused quinoxaline derivatives using magnetically separable core–shell CoFe2O4@SiO2‐SO3H nanocatalyst under ultrasonication

A Sustainable Synthesis of Functionalized Pyrrole Fused Coumarins under Solvent‐Free Conditions Using Magnetic Nanocatalyst and a New Route to Polyaromatic Indolocoumarins

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Product

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CoFe₂O₄–SiO₂–SO₃H nanocomposite as a magnetically recoverable catalyst for oxidative bromination of alkynes

Expeditious synthesis of diverse spiro fused quinoxaline derivatives using magnetically separable core–shell CoFe₂O₄@SiO₂‐SO₃H nanocatalyst under ultrasonication