Fe(III) superoxide radicals in halloysite nanotubes for visible-light-assisted benzyl alcohol oxidation and oxidative C C coupling of 2-naphthol

Baruah, Manash J.; Bora, Tonmoy J.; Dutta, Rupjyoti; Roy, Subhasish; Guha, Ankur Kanti; Bania, Kusum K.

doi:10.1016/j.mcat.2021.111858

Cited by 18 publications

(25 citation statements)

References 78 publications

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“…9,12 Very recently, we found halloysite-supported Fe 2 O 3 nanocatalyst as an efficient photocatalyst for various alcohol oxidation reactions. 14 Among the different types of aluminosilicates, zeolite-Y with a pore opening of ∼0.74 nm and having a super-cage of ∼1.3 nm is used as a suitable host for metal catalysts. 15 They are also known as "zeozymes" as zeolite-Y can provide a similar steric and confinement effect similar to that of metalloenzymes.…”

Section: Introductionmentioning

confidence: 99%

Fe₂O₃ Nanocatalysts Supported on Zeolite-Y for the Selective Synthesis of C2 Di-Indolyl Indolones and Isatins

Baruah

Dutta

Biswas

et al. 2022

ACS Appl. Nano Mater.

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Iron-oxide (Fe 2 O 3 ) nanoparticles in the dimension of ∼2.3 nm supported on zeolite-Y appeared as an excellent, reusable heterogeneous catalyst for the chromatography-free selective synthesis of 2,2-di(3-indolyl)-3-indolones, a C2-trimerized product. The zeolite-Y-supported Fe-oxide nanocatalyst showed the catalytic activity better than the Pd-and Au-based catalysts in the synthesis of C2 di-indolyl indolones under the prevailing reaction conditions. Besides, this low-cost catalyst displayed the ability to synthesize the pharmaceutically significant isatin molecules with high selectivity. The nature of the solvent and oxidant played a crucial role in the regioselective trimerization of indoles. The selective formation of the C2-trimerized product was accomplished in acetonitrile with peroxymonosulfate (oxone) as the oxidant, while in a water/acetonitrile mixture, it led to the formation of isatin. Compared to many other high-cost catalysts, the cheaper zeolite-Y-supported iron oxide catalyst promoted the reaction at room temperature with high selectivity. The products were obtained within 15−30 min with ≤95% yield. Different pieces of spectroscopic and electrochemical evidence supported by density functional theory (DFT) studies provided strong evidence for the proposed reaction mechanism. The kinetics of the reaction was studied through UV−vis spectroscopy and found to follow first-order kinetics. The UV−vis spectrum of the C2-trimerized product was further evaluated through time-dependent DFT calculations. The CO 2temperature programmed desorption study indicated the presence of strong basic sites in the Fe 2 O 3 -Y catalyst, favoring the interaction of the acidic indole molecule with the catalyst surface.

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Section: Introductionmentioning

confidence: 99%

Fe₂O₃ Nanocatalysts Supported on Zeolite-Y for the Selective Synthesis of C2 Di-Indolyl Indolones and Isatins

Baruah

Dutta

Biswas

et al. 2022

ACS Appl. Nano Mater.

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“…[19][20][21] Furthermore, both surfaces of Hal can be modified through covalent or noncovalent approaches. [22][23][24] This leads a broad scope of uses for halloysites, from the bio field,[ 25,26 ] resulted in rapid growth of Hal-based catalysts for various chemical reactions, [27] including hydrogenation [28,29] and oxidation reactions, [30] as well as synthesis of organic compounds. [31,32] Polyalphaolefin (PAO)-type lubricants synthesized from long α-olefin monomers, generally from C6 to C12, is of the group IV of the American Petroleum Institute (API) category.…”

Section: Introductionmentioning

confidence: 99%

Effect of support hydrophobicity of halloysite‐based catalysts on the polyalphaolefin hydrofinishing performance

Shams

Sadjadi

Duran

et al. 2022

Applied Organom Chemis

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Hydrogenation of polyalphaolefins (PAOs) is an industrial process catalyzed by supported precious metals. In this regard, halloysite (Hal) clay has been proven as an efficient support for the immobilization of Pd nanoparticles and development of high-performance catalysts under mild reaction condition. In this research, the effect of Hal hydrophobicity on the PAO hydrofinishing efficiency is studied. In this line, cetrimonium bromide (CTAB) was used for adjusting the hydrophobicity of halloysite surface. Three catalysts, Hal/Pd, Hal/Pd/CTAB, and Hal/CTAB/Pd, were fabricated by palladation of Hal, treating palladated Hal with CTAB and palladation of CTAB-treated Hal, respectively. The catalysts were characterized, and their activity for the hydrogenation of PAO was appraised. Moreover, a molecular simulation approach was employed to survey the effect of surface hydrophobicity of Hal on the alkene hydrogenation energy diagram and the steric maps of the main catalytic stages. Both experimental and computational studies approved that the presence of CTAB detracts the activity of the catalyst. Moreover, the order of introduction of Pd and CTAB affects the content of incorporated CTAB and Pd and Pd particle size, and the order of catalysts activity was as follows:

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“…Some of the reported natural-based catalysts exhibited comparable or even superior activity compared to their synthetic counterparts. Natural compounds can be utilized either as the main catalytic species or as catalyst supports 7 , 8 . Moreover, they can be applied as potent reducing or capping agents for the synthesis of nanoparticles (NPs) 9 .…”

Section: Introductionmentioning

confidence: 99%

Pd on cyclotriphosphazen-hexa imine decorated boehmite as an efficient catalyst for hydrogenation of nitro arenes under mild reaction condition

Sadjadi

Abedian-Dehaghani

Heravi

2022

Sci Rep

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Cyclotriphosphazen-hexa imine ligand was prepared through successive reactions of phosphonitrilchloride trimer with 4-hydroxybenzaldehyde and (3-aminopropyl) triethoxy silane. The as-prepared ligand was then covalently grafted on boehmite to furnish an efficient support for the immobilization of Pd nanoparticles and synthesis of a novel heterogeneous catalyst for hydrogenation of nitro arenes. The catalytic tests revealed that the catalyst had excellent catalytic activity for hydrogenation of various nitro arenes with different steric and electronic features under mild reaction condition in aqueous media. Noteworthy, the catalyst was highly selective and in the substrates with ketone or aldehyde functionalities, reduction of nitro group was only observed. The catalyst was also recyclable and only slight loss of activity was detected after each recycling run. Hot filtration test also approved true heterogeneous nature of catalysis.

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Fe(III) superoxide radicals in halloysite nanotubes for visible-light-assisted benzyl alcohol oxidation and oxidative C C coupling of 2-naphthol

Cited by 18 publications

References 78 publications

Fe₂O₃ Nanocatalysts Supported on Zeolite-Y for the Selective Synthesis of C2 Di-Indolyl Indolones and Isatins

Fe₂O₃ Nanocatalysts Supported on Zeolite-Y for the Selective Synthesis of C2 Di-Indolyl Indolones and Isatins

Effect of support hydrophobicity of halloysite‐based catalysts on the polyalphaolefin hydrofinishing performance

Pd on cyclotriphosphazen-hexa imine decorated boehmite as an efficient catalyst for hydrogenation of nitro arenes under mild reaction condition

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Fe(III) superoxide radicals in halloysite nanotubes for visible-light-assisted benzyl alcohol oxidation and oxidative C C coupling of 2-naphthol

Cited by 18 publications

References 78 publications

Fe2O3 Nanocatalysts Supported on Zeolite-Y for the Selective Synthesis of C2 Di-Indolyl Indolones and Isatins

Fe2O3 Nanocatalysts Supported on Zeolite-Y for the Selective Synthesis of C2 Di-Indolyl Indolones and Isatins

Effect of support hydrophobicity of halloysite‐based catalysts on the polyalphaolefin hydrofinishing performance

Pd on cyclotriphosphazen-hexa imine decorated boehmite as an efficient catalyst for hydrogenation of nitro arenes under mild reaction condition

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Fe₂O₃ Nanocatalysts Supported on Zeolite-Y for the Selective Synthesis of C2 Di-Indolyl Indolones and Isatins

Fe₂O₃ Nanocatalysts Supported on Zeolite-Y for the Selective Synthesis of C2 Di-Indolyl Indolones and Isatins