関連する実験動画
Updated: Sep 9, 2025

10:44
Isolating Free Carbenes, their Mixed Dimers and Organic Radicals
Published on: April 19, 2019
11.0K
プラチナ α,β-不飽和カルベンの添加物におけるアルリシランの二極的行動
Jeff P Costello1, Jacob P Garber1, Khoi Q Huynh1
1Department of Chemistry, University of Georgia Athens Georgia 30602 USA emferr@uga.edu.
Chemical science
|September 5, 2025
まとめ
アリルシランは,プラチナカルベンと二重反応性を示し,多様なヘテロサイクル製品を生成する. サイクル添加とアリレーションを含む反応経路は,触媒条件と溶媒の影響によって制御される.
科学分野:
- 有機金属化学
- 合成有機化学
- キャタリシス
背景:
- アリルシランは多用途の合成中間物質である.
- プラチナカルベンの複合体は有機合成における反応性である.
- 複雑な分子の効率的な合成には 反応経路の制御が不可欠です
研究 の 目的:
- アリシランとα,β不飽和プラチナカルベンの二重反応性を調査する.
- 触媒条件が反応結果にどのように影響するか調べる.
- 装飾されたインドルとベンゾフランを合成する方法を開発する.
主な方法:
- アルリシランとプラチナカルベンの複合体との反応
- 異なる溶媒条件 (非極性対ルイス基本) を利用する.
- スペクトロスコーピック方法によるヘテロサイクリック製品の特徴付け
主要な成果:
- 非極性条件下での (3+2) サイクル添加が実証され,トリサイクルインドル/ベンゾフランが得られる.
- ルイスの基本条件下でC2アリレーションを示し,アリレーテッドインドール/ベンゾフランを形成した.
- 様々なヘテロサイクルの製品で良い収穫量を得ました.
結論:
- アルリシランとプラチナカルベンの反応性は二分性であり,溶媒に依存する.
- 溶媒効果は中間安定化を調節し,異なった機械的経路につながります.
- この研究は,多様なヘテロサイクルのスキャファードにアクセスするための調整可能な合成戦略を提供します.
関連する概念動画
Electrophilic Addition to Alkynes: Halogenation
8.7K
Introduction
Halogenation is another class of electrophilic addition reactions where a halogen molecule gets added across a π bond. In alkynes, the presence of two π bonds allows for the addition of two equivalents of halogens (bromine or chlorine). The addition of the first halogen molecule forms a trans-dihaloalkene as the major product and the cis isomer as the minor product. Subsequent addition of the second equivalent yields the tetrahalide.
Halogenation is another class of electrophilic addition reactions where a halogen molecule gets added across a π bond. In alkynes, the presence of two π bonds allows for the addition of two equivalents of halogens (bromine or chlorine). The addition of the first halogen molecule forms a trans-dihaloalkene as the major product and the cis isomer as the minor product. Subsequent addition of the second equivalent yields the tetrahalide.
8.7K
Radical Substitution: Allylic Bromination
5.3K
In organic synthesis, the formation of products can be altered by changing the reaction conditions. For example, a dibromo addition product is formed when propene is treated with bromine at room temperature. In contrast, propene undergoes allylic substitution in non-polar solvents at high temperatures to give 3-bromopropene. In order to avoid the addition reaction, the bromine concentration must be kept as low as possible throughout the reaction. This can be achieved using N-bromosuccinimide...
5.3K
Nucleophilic Aromatic Substitution: Elimination–Addition
4.1K
Simple aryl halides do not react with nucleophiles. However, nucleophilic aromatic substitutions can be forced under certain conditions, such as high temperatures or strong bases. The mechanism of substitution under such conditions involves the highly unstable and reactive benzyne intermediate. Benzyne contains equivalent carbon centers at both ends of the triple bond, each of which is equally susceptible to nucleophilic attack. This 50–50 distribution of products is...
4.1K
Radical Substitution: Allylic Chlorination
2.5K
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...
2.5K
Electrophilic 1,2- and 1,4-Addition of X2 to 1,3-Butadiene
2.7K
Electrophilic addition of halogens to alkenes proceeds via a cyclic halonium ion to form a 1,2-dihalide or a vicinal dihalide.
2.7K
Conjugate Addition to α,β-Unsaturated Carbonyl Compounds
4.5K
α,β-Unsaturated carbonyl compounds are molecules bearing a carbonyl and alkene functionality in conjugation with each other. The conjugation in the molecule leads to three resonance structures. The hybrid form exhibits two probable electrophilic sites: the carbonyl carbon and the β carbon.
4.5K

