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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

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 more stable,...
5.3K
Diels–Alder Reaction: Characteristics of Dienophiles01:24

Diels–Alder Reaction: Characteristics of Dienophiles

7.5K
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...
7.5K
Diels–Alder Reaction Forming Cyclic Products: Stereochemistry01:28

Diels–Alder Reaction Forming Cyclic Products: Stereochemistry

4.9K
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.
4.9K
Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry01:29

Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry

5.8K
Diels–Alder reactions between cyclic dienes locked in an s-cis configuration and dienophiles yield bridged bicyclic products.
5.8K
[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction01:16

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

12.3K
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.
12.3K

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Diels-Alder adduct formation at solid interfaces between fullerenes and acenes.

T Breuer1, T Geiger2, H F Bettinger2

  • 1Department of Physics, Molekulare Festkörperphysik, Philipps-Universität Marburg, 35032, Marburg, Germany.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|December 8, 2018
PubMed
Summary

Chemical reactions at organic interfaces, like Diels-Alder (D-A) adduct formation in pentacene/Buckminster-Fullerene (C60) systems, are crucial for organic photovoltaics. This study reveals D-A adduct formation is most efficient in bulk heterojunctions.

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Surface Chemistry

Background:

  • Organic-organic interfaces present complex challenges in morphology, molecular orientation, interdiffusion, and energetics.
  • Chemical reactions at these interfaces are often overlooked but critical for device performance.
  • Pentacene/Buckminster-Fullerene (C60) is a model donor-acceptor system for organic photovoltaics.

Purpose of the Study:

  • To investigate the temperature dependence and reaction zone depth of Diels-Alder (D-A) adduct formation at pentacene/C60 interfaces.
  • To explore the influence of interface morphology on D-A adduct formation efficiency.
  • To identify trends in D-A adduct formation across various organic material combinations.

Main Methods:

  • Near Edge X-ray Absorption Fine Structure (NEXAFS) spectroscopy was employed for detailed interface analysis.
  • Systematic variation of interface morphology, including bulk heterojunctions.
  • Investigation of different organic material combinations, such as PEN/C60-PCBM and functionalized acenes with C60.

Main Results:

  • Diels-Alder (D-A) adduct formation was confirmed and quantified at pentacene/C60 interfaces.
  • Adduct formation efficiency was found to be highly dependent on temperature and reaction zone depth.
  • Bulk heterojunction morphologies exhibited the most efficient D-A adduct formation.
  • Trends in D-A adduct formation correlated with the chemical properties of the investigated organic compounds.

Conclusions:

  • Chemical reactions, specifically Diels-Alder adduct formation, significantly impact organic-organic interfaces.
  • Interface morphology, particularly bulk heterojunctions, plays a key role in optimizing D-A adduct formation.
  • Understanding these chemical processes is essential for advancing organic photovoltaic device design and performance.