Cobalt-Catalyzed Enantioselective Dicarbofunctionalization of Acrylates

ACS Catalysis, Год журнала: 2024, Номер unknown, С. 15221 - 15236

Опубликована: Окт. 2, 2024

Язык: Английский

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Surface self-modification of TiO2 for enhanced photocatalytic toluene oxidation via photothermal effect

Journal of Catalysis, Год журнала: 2024, Номер 440, С. 115846 - 115846

Опубликована: Ноя. 13, 2024

Язык: Английский

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Synthesis and application of triptycene based oligomers for the stereoselective aldol reaction of isatin and ketones

Molecular Catalysis, Год журнала: 2024, Номер 568, С. 114462 - 114462

Опубликована: Авг. 28, 2024

Язык: Английский

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Cobalt-Hydride-Catalyzed Alkene-Carboxylate Transposition (ACT) of Allyl Carboxylates

Journal of the American Chemical Society, Год журнала: 2024, Номер 146(46), С. 31391 - 31399

Опубликована: Ноя. 12, 2024

The alkene-carboxylate transposition (ACT) of allyl carboxylates is one the most atom-economic and synthetically reliable transformations in organic chemistry, as are versatile synthetic intermediates. Classic ACT transformations, including [3,3]-sigmatropic rearrangement transition metal-catalyzed allylic rearrangement, typically yield 1,2-alkene/1,3-acyloxy shifted products through a two-electron process. However, position-altered to produce distinct 1,3-alkene/1,2-acyloxy remains elusive. Here, we report first cobalt-hydride-catalyzed carboxylates, enabling access these unprecedented via 1,2-radical migration (RaM) strategy. This transformation demonstrates broad functional group tolerance, suitable for late-stage modification complex molecules, amenable gram-scale synthesis. It also expands reaction profiles both cobalt catalysis. Preliminary experimental computational studies suggest mechanism involving metal-hydride hydrogen atom transfer (MHAT) 1,2-RaM expected serve basis development Co-H-catalyzed generating wide array valuable building blocks synthetic, medicinal, materials chemistry.

Язык: Английский

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The penetration depth of atomic radicals in tubes with catalytic surface properties

Plasma Science and Technology, Год журнала: 2024, Номер 26(7), С. 075510 - 075510

Опубликована: Апрель 1, 2024

Abstract Catalysis of molecular radicals is often performed in interesting experimental configurations. One possible configuration tubular geometry. The are introduced into the tubes on one side, and stable molecules exhausted other side. penetration depth depends numerous parameters, so it not always feasible to calculate it. This article presents systematic measurements oxygen atoms along made from nickel, cobalt, copper. source O was a surfatron-type microwave plasma. initial density depended gas flow 0.7×10 21 m −3 , 2.4×10 4.2×10 at rates 50, 300, 600 sccm, pressures 10, 35, 60 Pa, respectively. temperature remained room throughout experiments. dissociation fraction decreased exponentially length all cases. depths for well-oxidized nickel were 1.2, 1.7, 2.4 cm, For they slightly lower 1.0, 1.3, 1.6 respectively, while copper, 1.1, 1.7 results explained by dynamics heterogeneous surface association. These data useful any attempt estimate loss fragments tubes, which serve as catalysts association various molecules.

Язык: Английский

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Advanced Catalytic Syntheses of 1,3-Oxazine Derivatives via Electrophilic Substitution Using Mono- and Bimetallic Phosphate Catalysts: Co₃(PO 4 ) 2 and CoCa 3 (HPO 4 )(PO 4 ) 2 (OH)

Research Square (Research Square), Год журнала: 2024, Номер unknown

Опубликована: Авг. 2, 2024

This research introduces a novel catalytic approach for the synthesis of 1,3-oxazinone derivatives through multicomponent reaction that relies on an electrophilic substitution mechanism, employing two cobalt-based phosphate catalysts. approach, allowed us to synthesize oxazine derivatives, known their significant biological activities, achieving impressive yields up 97% in remarkably short time only 7 minutes, all under conditions environmentally friendly according principles green chemistry using ethanol/water mixture as solvent. In our study, we utilized catalysts derived from cobalt-modified phosphate, which were synthesized laboratory simple methods. The first support consists monometallic catalyst, denoted Co₃(PO₄)₂, whereas second is bimetallic catalyst modified with cobalt and calcium CoCa₃(HPO₄)(PO₄)₂(OH). Our developed methods had various advantages including simplicity process, rapid time, clean-up, ability recover reuse overall simplicity. All these render this effective viable synthesizing suitable large-scale applications.

Язык: Английский

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Advanced Catalytic Approaches for Synthesizing 1,2-dihydro-1-aryl-3H-naphtho[1,2-e]-[1,3]oxazin-3-one Derivatives through Electrophilic Substitution Reactions using Mono- and Bimetallic Phosphate Catalysts: A Study of Co₃(PO₄)₂ and CoCa₃(HPO₄)(PO₄)₂(OH)

Research Square (Research Square), Год журнала: 2024, Номер unknown

Опубликована: Авг. 7, 2024

This research introduces a novel catalytic approach for the synthesis of 1,3-oxazinone derivatives through multicomponent reaction that relies on an electrophilic substitution mechanism, employing two cobalt-based phosphate catalysts. approach, allowed us to synthesize oxazine derivatives, known their significant biological activities, achieving impressive yields up 97% in remarkably short time only 7 minutes, all under conditions environmentally friendly according principles green chemistry using ethanol/water mixture as solvent. In our study, we utilized catalysts derived from cobalt-modified phosphate, which were synthesized laboratory simple methods. The first support consists monometallic catalyst, denoted Co₃(PO₄)₂, whereas second is bimetallic catalyst modified with cobalt and calcium CoCa₃(HPO₄)(PO₄)₂(OH). Our developed methods had various advantages including simplicity process, rapid time, clean-up, ability recover reuse overall simplicity. All these render this effective viable synthesizing suitable large-scale applications.

Язык: Английский

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Cutting-edge technologies for the recovery of cobalt from different waste discards

Elsevier eBooks, Год журнала: 2024, Номер unknown, С. 365 - 391

Опубликована: Ноя. 15, 2024

Язык: Английский

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