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関連する概念動画

Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
Removing one hydrogen from the intervening CH2 group with both...
Benzene to Phenol via Cumene: Hock Process01:27

Benzene to Phenol via Cumene: Hock Process

The synthesis of phenol from benzene via cumene and cumene hydroperoxide is called the Hock process. First, a Friedel–Crafts alkylation reaction of benzene with propene gives cumene. Then cumene forms cumene hydroperoxide via a radical chain reaction. In the chain initiation step, the benzylic hydrogen is abstracted to give a benzylic radical. In the chain propagation step, the benzylic radical reacts with an oxygen diradical to form a cumene hydroperoxide radical. The cumene hydroperoxide...
Carbocations02:10

Carbocations

Carbocations are one of the reaction intermediates formed during several nucleophilic substitutions or elimination reactions. A carbocation is an electron-deficient species with the central carbon atom having six electrons and three bonded atoms. The central carbon in a carbocation is sp2 hybridized with trigonal planar geometry. It has an empty p orbital perpendicular to the plane of the structure that can accept electrons. Thus, carbocations act as strong electrophiles and may react with any...
Hydrolysis of Chlorobenzene to Phenol: Dow Process01:10

Hydrolysis of Chlorobenzene to Phenol: Dow Process

Simple aryl halides do not react with nucleophiles under normal conditions. However, the reaction can proceed under drastic conditions involving high temperatures and high pressure to give the substituted products. For example, chlorobenzene is converted to phenol using aqueous sodium hydroxide at 350 °C under high pressure by the Dow process. The reaction follows an elimination-addition mechanism involving a benzyne intermediate. Here, the chloride ion is eliminated to generate the benzyne...
Nucleophilic Aromatic Substitution: Elimination–Addition01:11

Nucleophilic Aromatic Substitution: Elimination–Addition

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 confirmed through isotopic...
Aldehydes and Ketones with HCN: Cyanohydrin Formation Overview01:32

Aldehydes and Ketones with HCN: Cyanohydrin Formation Overview

Cyanohydrins are compounds that contain –CN and –OH groups on the same carbon atom. They are formed by the nucleophilic addition of the cyanide ions to the carbonyl group. Cyanide ions are highly basic and nucleophilic and can be generated from HCN under aqueous conditions. However, since HCN is a weak acid, the number of cyanide ions generated is very small. Hence, a small amount of base or KCN/NaCN is added to HCN to increase the concentration of the cyanide ions in the reaction mixture.

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関連する実験動画

Updated: Jun 13, 2026

Synthesis of Antiviral Tetrahydrocarbazole Derivatives by Photochemical and Acid-catalyzed C-H Functionalization via Intermediate Peroxides (CHIPS)
06:34

Synthesis of Antiviral Tetrahydrocarbazole Derivatives by Photochemical and Acid-catalyzed C-H Functionalization via Intermediate Peroxides (CHIPS)

Published on: June 20, 2014

フェニルヒドロキシカルベンは,

Dennis Gerbig1, Hans Peter Reisenauer, Chia-Hua Wu

  • 1Justus-Liebig University, Heinrich-Buff-Ring 58, 35392 Giessen, Germany.

Journal of the American Chemical Society
|May 14, 2010
PubMed
まとめ
この要約は機械生成です。

ペニルヒドロキシカルベン,親アリルヒドロキシカルベンが生成され,特徴づけられました. 量子力学的な水素トンネルをベンザルデヒドに掘り起こし,温度の影響を受けず,デュテレーションによって停止するプロセスを示しています.

さらに関連する動画

Isolating Free Carbenes, their Mixed Dimers and Organic Radicals
10:44

Isolating Free Carbenes, their Mixed Dimers and Organic Radicals

Published on: April 19, 2019

Preparation and Use of Carbonyl-decorated Carbenes in the Activation of White Phosphorus
14:07

Preparation and Use of Carbonyl-decorated Carbenes in the Activation of White Phosphorus

Published on: October 3, 2014

関連する実験動画

Last Updated: Jun 13, 2026

Synthesis of Antiviral Tetrahydrocarbazole Derivatives by Photochemical and Acid-catalyzed C-H Functionalization via Intermediate Peroxides (CHIPS)
06:34

Synthesis of Antiviral Tetrahydrocarbazole Derivatives by Photochemical and Acid-catalyzed C-H Functionalization via Intermediate Peroxides (CHIPS)

Published on: June 20, 2014

Isolating Free Carbenes, their Mixed Dimers and Organic Radicals
10:44

Isolating Free Carbenes, their Mixed Dimers and Organic Radicals

Published on: April 19, 2019

Preparation and Use of Carbonyl-decorated Carbenes in the Activation of White Phosphorus
14:07

Preparation and Use of Carbonyl-decorated Carbenes in the Activation of White Phosphorus

Published on: October 3, 2014

科学分野:

  • 物理有機化学 物理有機化学
  • スペクトロスコーピーは,スペクトロスコーピーを用います.
  • コンピューティング・ケミストリー

背景:

  • カーベンは,有機合成において極めて重要な反応性中間物質である.
  • トンネリングを含むカルベンの反応機構を理解することは,化学的変換を制御する上で鍵となる.

研究 の 目的:

  • フェニルヒドロキシカルベン (Ph-C-OH) を生成し,特徴づけるために,親アリルヒドロキシカルベン.
  • フェニルヒドロキシカルベンの反応機構と運動学,特に水素トンネリングを調査する.
  • 実験結果と反応経路やエネルギーバリアに関する理論的予測を比較する.

主な方法:

  • 600°Cでのフェニルグリオキシル酸の高真空フラッシュ Pyrolysis で,フェニルヒドロキシカルベンを生成する.
  • 11 Kの固体アルゴンのマトリックス分離により,スペクトロスコーピカル特徴付け (IR,UV-vis) を行う.
  • 振動周波数,興奮エネルギー,および反応経路分析のための高レベルの初期計算 (CCSD, EOM-CCSD).

主要な成果:

  • フェニルヒドロキシカルベンは成功裏に生成され,スペクトロスコープで特定されました.
  • 観測された赤外線と紫外線の光スペクトルは,計算された周波数と興奮エネルギーと非常に一致していました.
  • フェニルヒドロキシカルベンは,高活性化バリア (28.8 kcal mol−1) があるにもかかわらず,冷凍温度で半減期2.5時間のベンザルデヒドへの簡単な量子力学的水素トンネリングを経験します.
  • フェニルヒドロキシカルベンのデュテレーションは,トンネリング反応を効果的に抑制しました.

結論:

  • 親であるアリルヒドロキシカルベンのフェニルヒドロキシカルベンは合成され,特徴づけられました.
  • この研究は,低温でもフェニルヒドロキシカルベンの支配的な反応経路として,量子力学的な水素トンネリングの説得力のある証拠を提供します.
  • 理論的計算は実験的観測を正確に予測し,カルベンの反応動態を研究するための計算的アプローチを検証します.