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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...

Nucleophilic Acyl Substitution of Carboxylic Acid Derivatives

Nucleophilic Acyl Substitution of Carboxylic Acid Derivatives

Nucleophilic acyl substitution is an important class of substitution reactions involving a nucleophile and an acyl compound, such as carboxylic acids and their derivatives. In these reactions, the leaving group attached to the acyl group is substituted by a nucleophile. The general mechanism proceeds via two steps.

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...

Electrophilic Aromatic Substitution: Overview

Electrophilic Aromatic Substitution: Overview

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

Reactions of α-Halocarbonyl Compounds: Nucleophilic Substitution

Reactions of α-Halocarbonyl Compounds: Nucleophilic Substitution

Nucleophilic substitution in α-halocarbonyl compounds can be achieved via an SN2 pathway. The reaction in α-haloketones is generally carried out with less basic nucleophiles. The use of strong basic nucleophiles leads to the generation of α-haloenolate ions, which often participate in other side reactions.

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...

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Updated: Apr 21, 2026

Metal-free Synthesis of Ynones from Acyl Chlorides and Potassium Alkynyltrifluoroborate Salts

Metal-free Synthesis of Ynones from Acyl Chlorides and Potassium Alkynyltrifluoroborate Salts

Published on: February 24, 2015

Iron-Catalyzed Nucleophilic Substitution Reactions: An Overview.

Sasidharan Ramamoorthy¹, Mridula Ramasubramanian¹, Niharan Sivaraj¹

¹Chemistry Department, SAS, Vellore Institute of Technology - Chennai Campus, Vandalur-Kelambakkam Road, Chennai, Tamil Nadu 600127, India.

|April 20, 2026

Summary

This summary is machine-generated.

Iron catalysts are revolutionizing organic synthesis, offering a sustainable alternative to precious metals. This review highlights iron

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Area of Science:

Organic Chemistry
Catalysis
Materials Science

Background:

Transition metal complexes are vital catalysts in organic synthesis.
Iron offers a cost-effective, sustainable, and highly reactive alternative to noble metal catalysts.
Heterogeneous iron catalysts, particularly iron-oxide hybrids, demonstrate superior industrial performance.

Purpose of the Study:

To review advancements in iron-catalyzed nucleophilic substitution reactions.
To provide mechanistic insights into these transformations.
To discuss substrate scope and functional group compatibility.

Main Methods:

Literature review of iron-catalyzed nucleophilic substitution reactions.
Analysis of mechanistic pathways.
Examination of substrate scope and functional group tolerance.

Main Results:

Iron catalysts facilitate efficient C-C, C-N, C-O, and C-S bond formation under mild conditions.
Iron catalysis enables selective reductions and cross-coupling reactions.
Chiral iron catalysts are applicable in asymmetric synthesis.

Conclusions:

Iron catalysis is a powerful tool for organic synthesis, offering sustainability and versatility.
Iron-catalyzed nucleophilic substitutions provide efficient synthetic routes.
Further development of iron catalysts promises broader applications in industry.