塩化物とヨド酸塩を用いた軽アルカンの選択的単酸化
George C Fortman1, Nicholas C Boaz, Dominik Munz
1Department of Chemistry, University of Virginia , Charlottesville, Virginia 22904, United States.
Journal of the American Chemical Society
|May 29, 2014
まとめ
この研究は,プロティック溶媒におけるヨド酸塩とクロリド触媒を用いたアルカンの酸化のための効率的な方法を導入しています. このシステムは,メタン,エタン,プロパン酸化製品の高い変換と選択性を達成します.
科学分野:
- 化学的触媒は化学的触媒である.
- 有機合成による有機合成です.
- 酸化反応は,酸化反応によるものです.
背景:
- アルケンの直接的部分酸化は,化学における重要な課題であり続けています.
- 選択的で効率的な触媒システムの開発は,豊富なアルカン資源の利用に不可欠です.
研究 の 目的:
- メタン,エタン,プロパンの直接部分酸化のための効率的なシステムを開発する.
- これらの酸化反応における触媒としての塩化物の役割を調査する.
主な方法:
- 陽性溶媒 (HTFA,エセティック酸,水性HTFA) でヨウ素塩を使用する.
- 反応性と選択性を高めるために,塩化物の触媒量を使用する.
- (13) 反応経路と過酸化を追跡するためのCラベリング実験.
主要な成果:
- >20%のメタン変換を達成し,HTFAでメチル三酸塩 (MeTFA) に対する選択性は>85%でした.
- 塩化物の重要な役割を実証し,メタンの変換を<1%から>20%に増加させた.
- エタン (98%のエチル三酸塩) とプロパン酸化産物に対する高い選択性を示した.
結論:
- 記述されたシステムは,アルカンの直接部分酸化のための効率的で選択的な方法を提供します.
- 塩化物は,重要な触媒的役割を果たし,変換率を大幅に高めます.
- この方法論は,メタン,エタン,プロパンに適用可能であり,より広範なアルカンの機能化の可能性があります.
さらに関連する動画
関連する概念動画
01:27Radical Substitution: Halogenation of Alkanes and Alkyl Substituents
7.6K
In the presence of heat or light, alkanes react with molecular halogens to form alkyl halides by a substitution reaction called radical halogenation. This reaction has three steps: initiation, propagation, and termination, as seen in the radical chlorination of methane to produce methyl chloride.
In the initiation step of the reaction, the chlorine molecule undergoes homolytic cleavage in the presence of light or heat, forming two highly reactive chlorine radicals. Propagation occurs in two...
In the initiation step of the reaction, the chlorine molecule undergoes homolytic cleavage in the presence of light or heat, forming two highly reactive chlorine radicals. Propagation occurs in two...
7.6K
02:46Halogenation of Alkenes
17.0K
Halogenation is the addition of chlorine or bromine across the double bond in an alkene to yield a vicinal dihalide. The reaction occurs in the presence of inert and non-nucleophilic solvents, such as methylene chloride, chloroform, or carbon tetrachloride.
Consider the bromination of cyclopentene. Molecular bromine is polarized in the proximity of the π electrons of cyclopentene. An electrophilic bromine atom adds across the double bond, forming a cyclic bromonium ion intermediate.
Consider the bromination of cyclopentene. Molecular bromine is polarized in the proximity of the π electrons of cyclopentene. An electrophilic bromine atom adds across the double bond, forming a cyclic bromonium ion intermediate.
17.0K
02:44Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide
11.0K
Alkenes are converted to 1,2-diols or glycols through a process called dihydroxylation. It involves the addition of two hydroxyl groups across the double bond with two different stereochemical approaches, namely anti and syn. Dihydroxylation using osmium tetroxide progresses with syn stereochemistry.
11.0K
01:26Radical Substitution: Hydrogenolysis of Alkyl Halides with Tributyltin Hydride
1.5K
Radical substitution reactions can be used to remove functional groups from molecules. The hydrogenolysis of alkyl halides is one such reaction, where the weak Sn–H bond in tributyltin hydride reacts with alkyl halides to form alkanes. Here, the reagent Bu3SnH yields tributyltin halide as a byproduct.
The bonds formed in this reaction are stronger than the bonds broken, making it energetically favorable. The reaction follows a radical chain mechanism similar to radical halogenation...
The bonds formed in this reaction are stronger than the bonds broken, making it energetically favorable. The reaction follows a radical chain mechanism similar to radical halogenation...
1.5K
01:25Radical Anti-Markovnikov Addition to Alkenes: Overview
3.3K
The addition of hydrogen bromide to alkenes in the presence of hydroperoxides or peroxides proceeds via an anti-Markovnikov pathway and yields alkyl bromides.
3.3K
01:31Radical Substitution: Allylic Chlorination
2.6K
Typically, when alkenes react with halogens at low temperatures, an addition reaction occurs. However, upon increasing the temperature or under reaction conditions that form radicals, providing a low but steady concentration of halogen radicals, allylic substitution reaction is favored. This is because allylic hydrogens are very reactive as the formed intermediate is resonance stabilized. For example, when propene is treated with chlorine in the gas phase at 400 °C, it undergoes allylic...
2.6K