アルケンの無酸素分裂のために,ニトロアレンを用いた光誘導酸素移転
Dan E Wise1, Emma S Gogarnoiu1, Alana D Duke1
1Department of Chemistry, New York University, 24 Waverly Place, third floor, New York, New York 10003, United States.
Journal of the American Chemical Society
|August 5, 2022
まとめ
この研究は,ナイトロアレンと可視光を用いてアルケンをカルボニル化合物に割る新しい方法を導入している. この安全で無酸素なプロセスは,従来の酸化分断方法の実用的な代替案です.
科学分野:
- 有機化学
- 写真化学
- 合成方法論
背景:
- オゾノリシスのような伝統的なアルケンの割れ方方法は危険であり,機能群の許容性が欠けている.
- アルケンからカルボニル化合物を合成するために,より安全で多用途の代替品が必要である.
研究 の 目的:
- アルケンのカルボニル化合物への分裂のための新しい無酸素法を開発する.
- 可視光照射下での酸素移転反応剤としてニトロアレンを使用する.
- 既存の酸化分裂プロトコルに対して,実用的で効率的な代替手段を確立する.
主な方法:
- ニトロアレンによる可視光光触媒
- アナーロビック反応条件
- 根本的な時計の実験と,機械的解明のための in situ フォト-NMR スペクトロスコーピー.
主要な成果:
- 様々なアルケンをカルボニル化合物へと無酸素分解する.
- 分裂反応において高い効率と地域選択性が観察された.
- 主要な基因種とダイオキサゾリジンの中間物質をメカニズム研究で特定する.
結論:
- 開発された方法は,アルケンの酸化分裂のための安全で実用的なアプローチを提供します.
- 反応は,ニトロアレンの光刺激,ラジカル・サイクル添加,および中間断片化によって進行する.
- この光触媒戦略は,カルボニル化合物の合成の範囲を拡大する.
関連する概念動画
01:46Oxidative Cleavage of Alkenes: Ozonolysis
10.9K
In ozonolysis, ozone is used to cleave a carbon–carbon double bond to form aldehydes and ketones, or carboxylic acids, depending on the work-up.
Ozone is a symmetrical bent molecule stabilized by a resonance structure.
Ozone is a symmetrical bent molecule stabilized by a resonance structure.
10.9K
02:01Alkynes to Carboxylic Acids: Oxidative Cleavage
5.5K
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...
5.5K
02:36Oxymercuration-Reduction of Alkenes
7.8K
Oxymercuration–reduction of alkenes is one of the major reactions converting alkenes to alcohols. It involves the hydration of alkenes with mercuric acetate in a mixture of tetrahydrofuran and water, forming an organomercury adduct. This is followed by a demercuration step in which the adduct is reduced to an alcohol using sodium borohydride.
7.8K
01:26Oxygenic Photosynthesis
167
Oxygenic photosynthesis is a fundamental process in which light energy is harnessed to drive the oxidation of water, leading to the production of molecular oxygen (O₂), adenosine triphosphate (ATP), and nicotinamide adenine dinucleotide phosphate (NADPH). This process is essential for sustaining aerobic life on Earth and is primarily carried out by cyanobacteria, algae, and plants. The core of oxygenic photosynthesis lies in the thylakoid membranes, where chlorophyll pigments facilitate...
167
01:29Preparation of Amines: Reduction of Oximes and Nitro Compounds
4.0K
Oximes can be reduced to primary amines using catalytic hydrogenation, hydride reduction, or sodium metal reduction. The reduction of aliphatic and aromatic nitro compounds to primary amines takes place by either catalytic hydrogenation or by using active metals like Fe, Zn, and Sn in the presence of an acid.
Though catalytic hydrogenation can reduce nitrobenzenes, the reduction is nonselective in the presence of other functional groups. For instance, if nitrobenzene contains an aldehyde group,...
Though catalytic hydrogenation can reduce nitrobenzenes, the reduction is nonselective in the presence of other functional groups. For instance, if nitrobenzene contains an aldehyde group,...
4.0K
01:30Anoxygenic Photosynthesis
129
Anoxygenic photosynthesis is a phototrophic process that captures light energy to drive carbon fixation without producing molecular oxygen. Unlike oxygenic photosynthesis, which utilizes water as an electron donor and releases oxygen, anoxygenic phototrophs use alternative electron donors such as hydrogen sulfide (H₂S), elemental sulfur (S⁰), or thiosulfate (S₂O₃²⁻). This process is carried out by diverse groups of bacteria, including purple bacteria, green...
129