Green Carbon Science: Efficient Carbon Resource Processing, Utilization, and Recycling towards Carbon Neutrality

Angewandte Chemie International Edition, Journal Year: 2021, Volume and Issue: 61(15)

Published: Dec. 17, 2021

Green carbon science is defined as the "study and optimization of transformation carbon-containing compounds relevant processes involved in entire cycle from resource processing, energy utilization, CO2 fixation, recycling to utilize resources efficiently minimize net emission."[1] related closely neutrality, fields have developed quickly last decade. In this Minireview, we propose concept index, recent progress petroleum refining, production liquid fuels, chemicals, materials using coal, methane, , biomass, waste plastics highlighted combination with green science. An outlook for these important provided final section.

Language: Английский

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Organothianthrenium salts: synthesis and utilization

Chemical Science, Journal Year: 2022, Volume and Issue: 13(46), P. 13690 - 13707

Published: Jan. 1, 2022

This review summarizes the synthesis of diverse organothianthrenium salts from various precursors and their applications in organic to forge new C–C, C–H C–heteroatom bonds by C–S bond cleavage with different mechanistic considerations.

Language: Английский

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Selective Hydrodeoxygenation of Aromatics to Cyclohexanols over Ru Single Atoms Supported on CeO₂

Journal of the American Chemical Society, Journal Year: 2022, Volume and Issue: 144(45), P. 20834 - 20846

Published: Nov. 4, 2022

Cyclohexanols are widely used chemicals, which mainly produced by oxidation of fossil feedstocks. Selective hydrodeoxygenation lignin derivatives has great potential for producing these chemicals but is challenging to obtain high yields. Here, we report that CeO2-supported Ru single-atom catalysts (SACs) enabled the hydrogenation benzene ring and catalyzed etheric C-O(R) bond cleavage without changing C-O(H) bond, could afford 99.9% yields cyclohexanols. As far as know, this first SACs catalyze aromatic ring. The reaction mechanism was studied control experiments density functional theory calculations. In catalysts, Ru-O-Ce sites were formed one atom coordinated with about four O atoms. These catalytic realize both deoxygenation reactions efficiently, thus desired cyclohexanols generated. This work pioneers catalysis in transformation provides a novel route synthesis

Language: Английский

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Desulfonylative Transformations of Sulfones by Transition-Metal Catalysis, Photocatalysis, and Organocatalysis

ACS Catalysis, Journal Year: 2022, Volume and Issue: 12(5), P. 3013 - 3032

Published: Feb. 18, 2022

Sulfones are common, readily available reagents that have recently attracted attention as versatile for cross-coupling reactions. This Review summarizes advances in desulfonylative transformations of sulfones affected by molecular catalysis, including transition-metal catalysts, photocatalysts, and organocatalysts. In addition to catalyst choice, the design sulfonyl group is a critical factor control reactivity. The concepts presented herein will provide new strategies construct diverse molecules with high efficiency modularity.

Language: Английский

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In vitro antioxidant and free-radical scavenging activities of polar leaf extracts of Vernonia amygdalina

BMC Complementary Medicine and Therapies, Journal Year: 2023, Volume and Issue: 23(1)

Published: May 4, 2023

Plants are able to deliver a huge number of differing bioactive compounds which may supplement the requirements human body by acting as natural antioxidants. Antioxidants mindful for defense component life form against pathologies related assault free radicals. The main purpose this study was investigate qualitative phytochemical composition Vernonia amygdalina leaf extract and its antioxidant activity.The powdered plant sample successively extracted with aqueous, methanol ethanol solvents using Soxhlet apparatus. activities crude were determined 1, 1- diphenyl-2-picryl hydrazyl (DPPH) radical, 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid (ABTS) phosphomolybdate (PM) hydrogen peroxide (H2O2) scavenging assay. All examinations drained triplicates average values each test taken.Phytochemical investigation revealed that three solvent extracts contained numerous namely alkaloids, tannins, saponins, phenols, terpenoids, steroids, glycosides sugars. result showed that, V. obtained from exhibit maximum activity compared aqueous extracts. IC50 DPPH assay H2O, MeOH EtOH 111.4, 94.92 94.83 μg/ml; ABTS 334.3, 179.8 256.9 H2O2 141.6, 156 180.6 μg/ml, respectively. radical in while lowest method. data vitro models clearly suggest has higher due presence phenolic constituents extract.This noteworthy mitigating traditional use different aliments.

Language: Английский

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Reductive Deoxygenative Functionalization of Alcohols by First‐Row Transition Metal Catalysis

Chinese Journal of Chemistry, Journal Year: 2023, Volume and Issue: 41(13), P. 1637 - 1652

Published: Jan. 23, 2023

Comprehensive Summary Alcohols are among the most accessible functionalities. Catalytic deoxygenative functionalization of alcohols is highly synthetically appealing. While significant progress has been made on reactions with nucleophiles, electrophilic coupling partners remain a real challenge. This manuscript highlights advance in this direction, which mainly achieved by first‐row transition metals. The low‐valent titanium catalyst shown unique reactivity to homolytically cleave C—OH bonds. formed carbon radicals could either undergo reduction give protonation products or couple fragments form C—C chemistry initially realized using stoichiometric amount reagents and later extended catalytic variants. Nickel features variety oxidation states ranging from Ni 0 IV , both two‐electron oxidative addition single‐electron process involved their activation an electrophile. These properties enable nickel catalyze reductive R–X electrophiles. reaction first reported allylic alcohols, then benzylic and, very recently non‐activated alcohols. Recent effort resulted many invaluable methodologies that improve efficiency for construction aliphatic use cobalt copper catalysts not only expands substrate scope these but also shows new selectivity issues.

Language: Английский

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Intermetallic synergy in platinum–cobalt electrocatalysts for selective C–O bond cleavage

Nature Catalysis, Journal Year: 2024, Volume and Issue: 7(6), P. 702 - 718

Published: May 28, 2024

Language: Английский

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Photo-induced thiolate catalytic activation of inert Caryl-hetero bonds for radical borylation

Chem, Journal Year: 2021, Volume and Issue: 7(6), P. 1653 - 1665

Published: May 28, 2021

Language: Английский

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Carbonyl umpolung as an organometallic reagent surrogate

Chemical Society Reviews, Journal Year: 2021, Volume and Issue: 50(19), P. 10733 - 10742

Published: Jan. 1, 2021

Carbonyls can serve as surrogates for organometallic reagents via hydrazones.

Language: Английский

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Selective C–O Bond Reduction and Borylation of Aryl Ethers Catalyzed by a Rhodium–Aluminum Heterobimetallic Complex

Journal of the American Chemical Society, Journal Year: 2021, Volume and Issue: 143(17), P. 6388 - 6394

Published: April 22, 2021

We report the catalytic reduction of a C–O bond and borylation by rhodium complex bearing an X-type PAlP pincer ligand. have revealed reaction mechanism based on characterization intermediate deuterium-labeling experiments. Notably, this novel system shows steric-hindrance-dependent chemoselectivity that is distinct from conventional Ni-based catalysts suggests new strategy for selective activation heterobimetallic catalysis.

Language: Английский

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