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Cycloaddition Reactions: Overview

Cycloaddition Reactions: Overview

Cycloadditions are one of the most valuable and effective synthesis routes to form cyclic compounds. These are concerted pericyclic reactions between two unsaturated compounds resulting in a cyclic product with two new σ bonds formed at the expense of π bonds. The [4 + 2] cycloaddition, known as the Diels–Alder reaction, is the most common. The other example is a [2 + 2] cycloaddition.

Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)

Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)

Ring-opening metathesis polymerization or ROMP involves strained cycloalkenes as starting materials. The mechanism of ROMP proceeds by reacting cycloalkene with Grubbs catalyst to give metallacyclobutane intermediate which undergoes a ring-opening reaction to form new carbene. The new carbene reacts with another molecule of cycloalkene. Repetition of these steps leads to the formation of an unsaturated open-chain polymer product. All these steps are reversible, however, relieving the ring...

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...

Electrophilic Addition to Alkynes: Halogenation

Electrophilic Addition to Alkynes: Halogenation

Introduction
Halogenation is another class of electrophilic addition reactions where a halogen molecule gets added across a π bond. In alkynes, the presence of two π bonds allows for the addition of two equivalents of halogens (bromine or chlorine). The addition of the first halogen molecule forms a trans-dihaloalkene as the major product and the cis isomer as the minor product. Subsequent addition of the second equivalent yields the tetrahalide.

Nucleophilic Aromatic Substitution of Aryldiazonium Salts: Aromatic SN1

Nucleophilic Aromatic Substitution of Aryldiazonium Salts: Aromatic S_N1

Treating arylamines with nitrous acid gives aryldiazonium salts that are effective substrates in nucleophilic aromatic substitution reactions. The diazonio group in these salts can be easily displaced by different nucleophiles, yielding a wide variety of substituted benzenes. The leaving group departs as nitrogen gas, and this easy elimination is the driving force for the substitution reaction.
In the Sandmeyer reaction, for example, the diazonio group is replaced by a chloro, bromo,...

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...

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Related Experiment Video

Updated: Aug 4, 2025

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

Ring forming transformations of ynamides via cycloaddition.

Ramsha Iftikhar¹, Aqsa Mazhar², Muhammad Saqlain Iqbal³

¹Department of Chemistry, Government College University Faisalabad 38000-Faisalabad Pakistan Ramsha.mohsan@gmail.com.

|April 7, 2023

Summary

This summary is machine-generated.

Ynamides, N-alkyne compounds, offer versatile synthetic routes for creating valuable heterocyclic compounds through cycloaddition reactions. This review highlights recent advancements and applications in organic synthesis and medicinal chemistry.

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Area of Science:

Organic Chemistry
Medicinal Chemistry
Synthetic Chemistry

Background:

Ynamides are N-alkyne compounds with an electron-withdrawing group on the nitrogen atom.
They possess a unique balance of reactivity and stability, enabling diverse chemical transformations.
Heterocyclic compounds are crucial in pharmaceuticals and materials science.

Purpose of the Study:

To systematically review recent novel transformations involving ynamide cycloaddition reactions.
To illustrate the synthetic potential of ynamides and their derivatives in constructing complex molecules.
To discuss the scope and limitations of these cycloaddition reactions.

Main Methods:

Systematic literature review of recent studies on ynamide cycloadditions.
Analysis of reported synthetic pathways and applications.
Discussion of reaction scope, limitations, and potential future directions.

Main Results:

Ynamide cycloadditions provide facile and efficient routes to various heterocyclic structures.
These reactions yield advanced intermediates with significant synthetic and pharmaceutical value.
Recent studies demonstrate novel transformations and expanded applications of ynamides.

Conclusions:

Ynamide cycloaddition reactions are powerful tools for constructing important heterocyclic motifs.
These reactions are valuable in synthetic chemistry, medicinal chemistry, and materials science.
Further exploration of ynamide chemistry promises new synthetic methodologies and applications.