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Related Concept Videos

Diels–Alder Reaction Forming Cyclic Products: Stereochemistry01:28

Diels–Alder Reaction Forming Cyclic Products: Stereochemistry

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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.
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Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry01:29

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Diels–Alder reactions between cyclic dienes locked in an s-cis configuration and dienophiles yield bridged bicyclic products.
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[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction01:16

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

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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.
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Diels–Alder Reaction: Characteristics of Dienes01:29

Diels–Alder Reaction: Characteristics of Dienes

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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...
4.1K
Polymer Classification: Stereospecificity01:26

Polymer Classification: Stereospecificity

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Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
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[3,3] Sigmatropic Rearrangement of 1,5-Dienes: Cope Rearrangement01:21

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2.6K
The Cope rearrangement is classified as a [3,3] sigmatropic shift in 1,5-dienes, leading to a more stable, isomeric 1,5-diene. The reaction involves a concerted movement of six electrons, four from two π bonds and two from a σ bond, via an energetically favorable chair-like transition state.
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Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
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Stereochemical Shape Morphing in Diels-Alder Polymer Networks.

Junho Moon1, Zhen Sang1, Kartik Kumar Rajagopalan1

  • 1Department of Materials Science and Engineering, Texas A&M University, College Station, TX, 77843, USA.

Small (Weinheim an Der Bergstrasse, Germany)
|November 7, 2024
PubMed
Summary
This summary is machine-generated.

Dynamic covalent bonding in Diels-Alder polymer networks allows for reprocessable and self-healing materials. This study demonstrates tunable shape morphing by controlling isomer ratios through thermal annealing, enabling applications in soft robotics.

Keywords:
Diels‐Alder polymerscovalent adaptable networksshape morphingstereochemistry

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Dynamic Covalent Chemistry

Background:

  • Dynamic covalent bonds, like Diels-Alder (DA) reactions, enable self-healing and reprocessable polymers.
  • Stereochemical isomers (endo and exo) in DA bonds influence polymer network properties.

Purpose of the Study:

  • To leverage temperature-dependent isomer exchange in DA bonds for tunable shape morphing.
  • To investigate the impact of endo-to-exo isomer conversion on polymer mechanical properties and shape recovery.
  • To demonstrate spatially controlled shape morphing using localized thermal annealing.

Main Methods:

  • Utilized furan-maleimide Diels-Alder cycloaddition reactions in polymer networks.
  • Applied thermal annealing to convert endo DA isomers to exo DA isomers.
  • Investigated temperature-dependent changes in elastic modulus, stress relaxation, and shape recovery.
  • Employed spatially resolved annealing to control isomer distribution.

Main Results:

  • Thermal annealing converted ≈35% of endo DA isomers to exo, reaching ≈97% exo after 60°C annealing.
  • Elastic modulus increased ≈1.7 fold (from 1.7 to 3.0 MPa) with isomer conversion.
  • Spatially resolved annealing enabled precise control over stress relaxation rates and elastic strain recovery mismatch.
  • Demonstrated controlled stereochemical shape morphing through localized isomer concentration differences.

Conclusions:

  • Temperature-induced endo-to-exo isomer conversion offers a simplified, thermally driven method for shape morphing in polymer networks.
  • Tunable mechanical properties and shape recovery are achievable by controlling DA bond stereochemistry.
  • Potential applications exist in soft robotics and flexible electronics due to controlled shape morphing capabilities.