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Related Concept Videos

Diels–Alder vs Retro-Diels–Alder Reaction: Thermodynamic Factors01:31

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

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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.
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Diels–Alder Reaction: Characteristics of Dienes01:29

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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 more stable,...
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Diels–Alder Reaction: Characteristics of Dienophiles01:24

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In a Diels–Alder reaction, the diene is usually an electron-rich system and acts as a nucleophile, whereas the dienophile is electron-deficient and functions as an electrophile. Much like the diene, the nature of the dienophile significantly impacts the outcome of the reaction. 
Characteristics of Dienophiles
Generally, the best dienophiles are alkenes containing electron-withdrawing substituents such as carbonyl, nitrile, and nitro groups. The feasibility of a Diels–Alder reaction depends...
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Diels–Alder Reaction Forming Cyclic Products: Stereochemistry01:28

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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

12.6K
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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Computational Study of Microhydration in Sulfonated Diels-Alder Poly(phenylene) Polymers.

Todd M Alam1

  • 1Department of Organic Material Science , Sandia National Laboratories , Albuquerque , New Mexico 87185 , United States.

The Journal of Physical Chemistry. A
|March 29, 2018
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Summary

Microhydration in sulfonated Diels-Alder poly(phenylene) (SDAPP) membranes involves proton dissociation and ion pair formation. The polymer structure influences water networks, impacting proton transport and hydration behavior.

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Area of Science:

  • Materials Science
  • Computational Chemistry
  • Polymer Science

Background:

  • Sulfonated Diels-Alder poly(phenylene) (SDAPP) membranes are crucial for applications requiring proton transport.
  • Understanding microhydration is key to optimizing membrane performance.
  • The interplay between polymer structure and water molecules significantly affects material properties.

Purpose of the Study:

  • To investigate the microhydration mechanisms in SDAPP polymer membranes.
  • To elucidate the role of the poly(phenylene) structure and sulfonic acid groups in water interactions.
  • To establish a computational baseline for SDAPP membrane hydration and proton transport.

Main Methods:

  • Ab initio and density functional theory (DFT) electronic structure calculations.
  • DFT B3LYP/6-311** optimizations of SDAPP·nH2O clusters.
  • ONIOM HF/PM6 semiempirical calculations on larger polymer fragments and hydrophilic domains from MD simulations.

Main Results:

  • Spontaneous proton dissociation occurs at low hydration levels, forming H3O+ contact ion pairs (CIPs).
  • CIPs transition to solvated forms at higher hydration levels.
  • Hydration energies depend on sulfonic acid group proximity and backbone conformation, enabling extended water networks.

Conclusions:

  • The study provides fundamental insights into the microhydration of SDAPP membranes.
  • Computational models reveal the influence of polymer architecture on water behavior and proton transport.
  • These findings are essential for designing advanced proton-exchange membranes.