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関連する概念動画

Nucleophilic Substitution Reactions02:34

Nucleophilic Substitution Reactions

Historical perspective
In 1896, the German chemist Paul Walden discovered that he could interconvert pure enantiomeric (+) and (-) malic acids through a series of reactions. This conversion suggested the involvement of optical inversion during the substitution reaction. Further, in 1930, Sir Christopher Ingold described for the first time two different forms of nucleophilic substitution reactions, which are known as SN1 (nucleophilic substitution unimolecular) and SN2 (nucleophilic substitution...
SN2 Reaction: Kinetics02:14

SN2 Reaction: Kinetics

Kinetic Studies and Significance
In a chemical reaction, a relationship exists between the concentration of reactants and the rate at which the reaction proceeds. The study to measure this relationship is known as the kinetics of a chemical reaction. Kinetic studies are used to deduce the rate law of a chemical reaction, which provides information about the species involved during the transition state of the rate-determining step. Thus, kinetic studies help to derive the mechanism of a reaction.
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...
Nucleophilic Aromatic Substitution: Addition–Elimination (SNAr)01:30

Nucleophilic Aromatic Substitution: Addition–Elimination (SNAr)

Nucleophilic substitution in aromatic compounds is feasible in substrates bearing strong electron-withdrawing substituents positioned ortho or para to the leaving group. The reaction proceeds via two steps: the addition of the nucleophile and the elimination of the leaving group.
The reaction begins with an attack of the nucleophile on the carbon that holds the leaving group. This results in the delocalization of the π electrons over the ring carbons. The resonance interaction between the...
SN1 Reaction: Stereochemistry02:15

SN1 Reaction: Stereochemistry

This lesson provides an in-depth discussion of the stereochemical outcomes in an SN1 reaction.
In the first step of an SN1 reaction, the bond between the electrophilic carbon and the leaving group ionizes to generate the carbocation intermediate. The second step of the mechanism is the nucleophilic attack.
In the formed carbocation, the positively charged carbon is sp2 hybridized with a trigonal planar geometry. As all the three substituents lie on the same plane, a plane of symmetry for the...
Electrophilic Aromatic Substitution: Overview01:16

Electrophilic Aromatic Substitution: Overview

In an electrophilic aromatic substitution reaction, an electrophile substitutes for a hydrogen of an aromatic compound.

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関連する実験動画

Updated: Jul 8, 2026

Photoelectron Imaging of Anions Illustrated by 310 Nm Detachment of F−
06:53

Photoelectron Imaging of Anions Illustrated by 310 Nm Detachment of F−

Published on: July 27, 2018

イメージングヌクレオフィール置換ダイナミクス

J Mikosch1, S Trippel, C Eichhorn

  • 1Physikalisches Institut, Universität Freiburg, Hermann-Herder-Strasse 3, 79104 Freiburg, Germany.

Science (New York, N.Y.)
|January 12, 2008
PubMed
まとめ
この要約は機械生成です。

この研究は,塩化イオン (Cl-) が核愛置換 (S(N) 2) を通してメチルヨウ素 (CH3I) とどのように反応するかを明らかにしています. 衝突エネルギーは反応経路を制御し,複合媒介から直接的な分散にシフトし,ユニークな分子回転ダイナミクスを含む.

さらに関連する動画

Rapid Scan Electron Paramagnetic Resonance Opens New Avenues for Imaging Physiologically Important Parameters In Vivo
08:01

Rapid Scan Electron Paramagnetic Resonance Opens New Avenues for Imaging Physiologically Important Parameters In Vivo

Published on: September 26, 2016

Dissolution Dynamic Nuclear Polarization Instrumentation for Real-time Enzymatic Reaction Rate Measurements by NMR
10:54

Dissolution Dynamic Nuclear Polarization Instrumentation for Real-time Enzymatic Reaction Rate Measurements by NMR

Published on: February 23, 2016

関連する実験動画

Last Updated: Jul 8, 2026

Photoelectron Imaging of Anions Illustrated by 310 Nm Detachment of F−
06:53

Photoelectron Imaging of Anions Illustrated by 310 Nm Detachment of F−

Published on: July 27, 2018

Rapid Scan Electron Paramagnetic Resonance Opens New Avenues for Imaging Physiologically Important Parameters In Vivo
08:01

Rapid Scan Electron Paramagnetic Resonance Opens New Avenues for Imaging Physiologically Important Parameters In Vivo

Published on: September 26, 2016

Dissolution Dynamic Nuclear Polarization Instrumentation for Real-time Enzymatic Reaction Rate Measurements by NMR
10:54

Dissolution Dynamic Nuclear Polarization Instrumentation for Real-time Enzymatic Reaction Rate Measurements by NMR

Published on: February 23, 2016

科学分野:

  • 化学ダイナミクス 化学ダイナミクス
  • 物理化学 物理化学
  • 分子反応メカニズム 分子反応メカニズム

背景:

  • アニオン-分子核性置換 (S(N) 2) 反応は,複雑な潜在エネルギー表面と量子状態のカップリングにより,複雑なダイナミクスを示します.
  • これらのダイナミクスを理解することは,化学反応性を予測し,新しい合成経路を設計するために不可欠です.

研究 の 目的:

  • クロリドイオン (Cl-) とメチルヨウ酸化物 (CH3I) の間のS(N) 2反応の詳細な反応ダイナミクスを解明する.
  • 衝突エネルギーが反応機構と産物散乱に及ぼす影響を調査する.

主な方法:

  • Cl- + CH3I反応を実験的に探査するためにクロス分子ビーム画像を用いた.
  • 反応経路とエネルギー転送をモデル化するために,詳細な化学動力学的計算を行いました.

主要な成果:

  • 衝突エネルギーが増加するにつれて,ヨウ素イオン (I-) の複合媒介からの直接逆流散への反応機構の移行が観察されました.
  • メチル基 (CH3) の回転を含む間接的な"回転"反応機構を特定した.

結論:

  • 衝突エネルギーは,Cl- + CH3IのS(N) 2反応機構を決定する重要な要因である.
  • この研究は,反応経路とエネルギー廃棄を制御する分子回転の役割に関する新しい洞察を明らかにしています.