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Nucleophilic Substitution Reactions

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: Kinetics

S_N2 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–Addition

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)

Nucleophilic Aromatic Substitution: Addition–Elimination (S_NAr)

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: Stereochemistry

S_N1 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: Overview

Electrophilic Aromatic Substitution: Overview

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

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Related Experiment Video

Updated: Jul 8, 2026

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

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

Published on: July 27, 2018

Imaging nucleophilic substitution dynamics.

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

Summary

This summary is machine-generated.

This study reveals how the chloride ion (Cl-) reacts with methyl iodide (CH3I) via nucleophilic substitution (S(N)2). Collision energy controls the reaction pathway, shifting from complex-mediated to direct scattering, involving unique molecular rotation dynamics.

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Last Updated: Jul 8, 2026

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

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

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

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

Published on: February 23, 2016

Area of Science:

Chemical Dynamics
Physical Chemistry
Molecular Reaction Mechanisms

Background:

Anion-molecule nucleophilic substitution (S(N)2) reactions exhibit complex dynamics due to intricate potential energy surfaces and quantum state coupling.
Understanding these dynamics is crucial for predicting chemical reactivity and designing new synthetic pathways.

Purpose of the Study:

To elucidate the detailed reaction dynamics of the S(N)2 reaction between chloride ion (Cl-) and methyl iodide (CH3I).
To investigate the influence of collision energy on the reaction mechanism and product scattering.

Main Methods:

Utilized crossed molecular beam imaging to experimentally probe the Cl- + CH3I reaction.
Performed detailed chemical dynamics calculations to model the reaction pathway and energy transfer.

Main Results:

Observed a transition in the reaction mechanism from complex-mediated to direct backward scattering of the iodide ion (I-) as collision energy increased.
Identified an indirect "roundabout" reaction mechanism involving the rotation of the methyl group (CH3).

Conclusions:

Collision energy is a critical factor determining the S(N)2 reaction mechanism for Cl- + CH3I.
The study reveals novel insights into the role of molecular rotation in governing reaction pathways and energy disposal.