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Related Concept Videos

[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction01:16

[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.
Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)

Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...
Diels–Alder Reaction Forming Cyclic Products: Stereochemistry01:28

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 Dienes01:29

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 more stable, the...
Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry01:29

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.

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Related Experiment Video

Updated: May 11, 2026

The Preparation and Properties of Thermo-reversibly Cross-linked Rubber Via Diels-Alder Chemistry
07:02

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

Published on: August 25, 2016

Reconfigurable biodegradable shape-memory elastomers via Diels-Alder coupling.

Chi Ninh1, Christopher J Bettinger

  • 1Department of Materials Science and Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213, United States.

Biomacromolecules
|May 18, 2013
PubMed
Summary
This summary is machine-generated.

Researchers developed novel biodegradable elastomers using Diels-Alder chemistry for advanced medical applications. These reconfigurable polymers offer unique processing advantages and shape-memory properties without catalysts or byproducts.

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Synthesis of Programmable Main-chain Liquid-crystalline Elastomers Using a Two-stage Thiol-acrylate Reaction
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Synthesis of Programmable Main-chain Liquid-crystalline Elastomers Using a Two-stage Thiol-acrylate Reaction

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Fabricating Degradable Thermoresponsive Hydrogels on Multiple Length Scales via Reactive Extrusion, Microfluidics, Self-assembly, and Electrospinning
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The Preparation and Properties of Thermo-reversibly Cross-linked Rubber Via Diels-Alder Chemistry
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Fabricating Degradable Thermoresponsive Hydrogels on Multiple Length Scales via Reactive Extrusion, Microfluidics, Self-assembly, and Electrospinning
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Fabricating Degradable Thermoresponsive Hydrogels on Multiple Length Scales via Reactive Extrusion, Microfluidics, Self-assembly, and Electrospinning

Published on: April 16, 2018

Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Biomaterials Engineering

Background:

  • Synthetic biodegradable elastomers are crucial biomaterials for medical applications.
  • Current elastomers are synthesized via step-growth or chain-growth polymerization, each with limitations.
  • Diels-Alder chemistry offers a novel approach for creating cross-linked polymer networks.

Purpose of the Study:

  • To synthesize and characterize novel biodegradable elastomers using Diels-Alder coupling reactions.
  • To investigate the processing capabilities and thermomechanical properties of these new elastomers.
  • To explore the potential for creating reconfigurable, shape-memory polymers for medical use.

Main Methods:

  • Synthesis of hyperbranched furan-modified polyester precursors (poly(glycerol-co-sebacate)).
  • Cross-linking precursors with bifunctional maleimide agents via Diels-Alder reactions.
  • Characterization of chemical and thermomechanical properties, and gel formation kinetics.

Main Results:

  • Successful fabrication of cross-linked polyester networks with tunable properties.
  • Demonstrated reconfigurable covalent networks without catalysts or byproducts.
  • Achieved shape-memory polymer capabilities with complex permanent geometries.
  • Experimental gel formation data correlated with Flory-Stockmayer theoretical predictions.

Conclusions:

  • Diels-Alder cycloaddition reactions provide a versatile platform for creating advanced biodegradable elastomers.
  • These elastomers exhibit unique processing advantages and reconfigurable properties, including shape memory.
  • The developed materials hold significant potential for diverse applications in medicine and beyond.