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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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Video Experimental Relacionado

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

Imagen de las dinámicas de sustitución nucleófila.

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
Resumen
Este resumen es generado por máquina.

Este estudio revela cómo el ion cloruro (Cl-) reacciona con el yoduro de metilo (CH3I) a través de la sustitución nucleófila (S(N) 2). La energía de colisión controla la vía de reacción, pasando de la dispersión mediada por complejos a la dispersión directa, que implica una dinámica de rotación molecular única.

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Área de la Ciencia:

  • La Dinámica Química es la Dinámica Química.
  • Química Física es la química física.
  • Mecanismos de reacción molecular Mecanismos de reacción molecular

Sus antecedentes:

  • Las reacciones de sustitución nucleofílica anión-molécula (S(N) 2) exhiben dinámicas complejas debido a las intrincadas superficies de energía potencial y el acoplamiento de estados cuánticos.
  • Comprender estas dinámicas es crucial para predecir la reactividad química y diseñar nuevas vías sintéticas.

Objetivo del estudio:

  • Para aclarar la dinámica de reacción detallada de la reacción S(N) 2 entre el ion cloruro (Cl-) y el yoduro de metilo (CH3I).
  • Para investigar la influencia de la energía de colisión en el mecanismo de reacción y la dispersión del producto.

Principales métodos:

  • Utilizó imágenes de haz molecular cruzado para sondear experimentalmente la reacción Cl- + CH3I.
  • Realizó cálculos detallados de dinámica química para modelar la vía de reacción y la transferencia de energía.

Principales resultados:

  • Se observó una transición en el mecanismo de reacción de difusión hacia atrás directa de los iones yoduro (I-) mediada por complejos a medida que aumentaba la energía de colisión.
  • Se identificó un mecanismo indirecto de reacción "redondo" que implica la rotación del grupo metilo (CH3).

Conclusiones:

  • La energía de colisión es un factor crítico que determina el mecanismo de reacción S(N) 2 para Cl- + CH3I.
  • El estudio revela nuevos conocimientos sobre el papel de la rotación molecular en el gobierno de las vías de reacción y la eliminación de energía.