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Updated: Jul 15, 2025

Achieving Moderate Pressures in Sealed Vessels Using Dry Ice As a Solid CO2 Source
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Achieving Moderate Pressures in Sealed Vessels Using Dry Ice As a Solid CO2 Source

Published on: August 17, 2018

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CO2によるアルキンのカルボキシル化のための触媒としての金 (I) -有機フレームワーク

Rong-Jia Wei1, Mo Xie1, Ri-Qin Xia1

  • 1College of Chemistry and Materials Science, and Guangdong Provincial Key Laboratory of Functional Supramolecular Coordination Materials and Applications, Jinan University, Guangzhou 510632, China.

Journal of the American Chemical Society
|October 4, 2023
PubMed
まとめ

研究者らは,環境条件の迅速な方法を使用して,最初の金ベースの金属有機フレームワーク (Au-MOF) を開発しました. これらの安定したAu-MOFは,炭酸酸化反応における二酸化炭素利用の触媒として有望である.

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Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation

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Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
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Carboxylic acids can be prepared by the carboxylation of Grignard reagents (RMgX). This method is convenient for converting alkyl (primary, secondary or tertiary), vinyl, benzyl, and aryl halides to carboxylic acids with one additional carbon than the starting RMgX.
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Alkynes to Aldehydes and Ketones: Hydroboration-Oxidation

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One of the convenient methods for the preparation of aldehydes and ketones is via hydration of alkynes. Hydroboration-oxidation of alkynes is an indirect hydration reaction in which an alkyne is treated with borane followed by oxidation with alkaline peroxide to form an enol that rapidly converts into an aldehyde or a ketone. Terminal alkynes form aldehydes, whereas internal alkynes give ketones as the final product.
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Carboxylic acids react with diazomethane in an ether solvent via alkylation at the carboxylate oxygen atom to give methyl esters of the corresponding acid with excellent yields.
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Alkynes to Carboxylic Acids: Oxidative Cleavage

Alkynes undergo oxidative cleavage in the presence of oxidizing reagents like potassium permanganate and ozone. The triple bond — one σ bond and two π bonds — is completely cleaved, and the alkyne is oxidized to carboxylic acids. When warm and basic aqueous potassium permanganate is used as an oxidizing agent, alkynes are first converted to carboxylate salts via an unstable α-diketone intermediate. Further, a mild acid treatment protonates the carboxylate anions...
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There are various methods for the preparation of carboxylic acids. For example, oxidation of primary alcohols or aldehydes using strong oxidizing agents results in a carboxylic acid.  Aldehydes can also be oxidized in the presence of mild oxidizing agents.
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