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[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction

[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction

The Diels–Alder reaction is an example of a thermal pericyclic reaction between a conjugated diene and an alkene or alkyne, commonly referred to as a dienophile. The reaction involves a concerted movement of six π electrons, four from the diene and two from the dienophile, forming an unsaturated six-membered ring. As a result, these reactions are classified as [4+2] cycloadditions.

Diels–Alder Reaction Forming Cyclic Products: Stereochemistry

Diels–Alder Reaction Forming Cyclic Products: Stereochemistry

The Diels–Alder reaction is one of the robust methods for synthesizing unsaturated six-membered rings. The reaction involves a concerted cyclic movement of six π electrons: four π electrons from the diene and two π electrons from the dienophile.

Diels–Alder Reaction: Characteristics of Dienes

Diels–Alder Reaction: Characteristics of Dienes

The Diels–Alder reaction brings together a diene and a dienophile to form a six-membered ring. Both components have unique characteristics that influence the rate of the reaction.
Characteristics of the diene
Conformation
The simplest example of a diene is 1,3-butadiene, an acyclic conjugated π system. At room temperature, the molecule exists as a mixture of s-cis and s-trans conformers by virtue of rotation around the carbon–carbon single bond. Although the s-trans isomer is...

Diels–Alder vs Retro-Diels–Alder Reaction: Thermodynamic Factors

Diels–Alder vs Retro-Diels–Alder Reaction: Thermodynamic Factors

The Diels–Alder reaction is thermally reversible, meaning that the reaction reverts to the starting diene and dienophile under suitable temperatures. The forward reaction gives a cyclohexene derivative and is favored at low to medium temperatures. The reverse process, also called retro-Diels–Alder reaction, is a ring-opening process favored at high temperatures.

Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry

Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry

Diels–Alder reactions between cyclic dienes locked in an s-cis configuration and dienophiles yield bridged bicyclic products.

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.

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Related Experiment Video

Updated: Oct 29, 2025

The Preparation and Properties of Thermo-reversibly Cross-linked Rubber Via Diels-Alder Chemistry

The Preparation and Properties of Thermo-reversibly Cross-linked Rubber Via Diels-Alder Chemistry

Published on: August 25, 2016

Self-assembly using a retro Diels-Alder reaction.

Jaeyoung Park¹, Jung-Moo Heo¹, Sicheon Seong²

¹Department of Chemical Engineering, Hanyang University, Seoul, Korea.

Nature Communications

|July 10, 2021

Summary

This summary is machine-generated.

This study introduces a novel self-assembly method triggered by the retro Diels-Alder (rDA) reaction. This approach efficiently creates supramolecular polymers from photopolymerizable building blocks, enabling new sensor designs.

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Area of Science:

Supramolecular Chemistry
Polymer Chemistry
Organic Synthesis

Background:

Diels-Alder (DA) and retro Diels-Alder (rDA) reactions are fundamental in chemistry but underexplored for self-assembly.
Controlled molecular assembly is crucial for advanced materials and sensors.

Purpose of the Study:

To report the first retro Diels-Alder (rDA) reaction-triggered self-assembly method.
To demonstrate the formation of supramolecular polymers using this strategy.
To explore the utility of the generated functional groups for sensor fabrication.

Main Methods:

Utilized a retro Diels-Alder (rDA) reaction to break down a bicyclic adduct into two building blocks.
Employed photopolymerizable lipid building blocks for self-assembly into a supramolecular polymer.
Leveraged the generated maleimide and furan functional groups for further modification.

Main Results:

Successfully demonstrated a novel rDA-triggered self-assembly process.
Generated supramolecular polymers from photopolymerizable lipid building blocks.
Fabricated stimulus-responsive colorimetric sensors using the reactive functional groups.

Conclusions:

The rDA-based self-assembly strategy is efficient for creating supramolecular polymers.
The method provides reactive functional groups for versatile material modification.
This approach offers a new platform for designing triggered molecular assembly systems and sensors.