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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 more stable, the...

Carboxylic Acids to Methylesters: Alkylation using Diazomethane

Carboxylic Acids to Methylesters: Alkylation using Diazomethane

Carboxylic acids react with diazomethane in an ether solvent via alkylation at the carboxylate oxygen atom to give methyl esters of the corresponding acid with excellent yields.

Diels–Alder Reaction: Characteristics of Dienophiles

Diels–Alder Reaction: Characteristics of Dienophiles

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 on...

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.

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Related Experiment Video

Updated: May 27, 2026

Electroactive Polymer Nanoparticles Exhibiting Photothermal Properties

Electroactive Polymer Nanoparticles Exhibiting Photothermal Properties

Published on: January 8, 2016

Diethyl 4,4'-(diazenediyl)dibenzoate.

Yongsheng Niu¹, Jianping Huang, Chunpu Zhao

¹Department of Chemistry and Environmental Engineering, Anyang Institute of Technology, Henan 455000, People's Republic of China.

Acta Crystallographica. Section E, Structure Reports Online

|November 9, 2011

Summary

This study reveals strong pi-pi interactions in a novel organic compound, C18H18N2O4. These interactions, observed through crystal structure analysis, are crucial for understanding molecular assembly and material properties.

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Area of Science:

Crystal chemistry
Organic chemistry
Supramolecular chemistry

Background:

Understanding intermolecular forces is key in crystal engineering.
Pi-pi interactions play a significant role in the self-assembly of organic molecules.
The title compound, C18H18N2O4, was synthesized for structural investigation.

Purpose of the Study:

To elucidate the crystal structure of the title compound.
To investigate the nature and strength of intermolecular interactions, specifically pi-pi stacking.
To provide insights into the molecular packing and solid-state properties.

Main Methods:

Single-crystal X-ray diffraction was employed to determine the molecular and crystal structure.
Analysis of the crystal packing revealed the presence of symmetry elements.
Intermolecular interactions, including pi-pi stacking, were quantified using geometric parameters.

Main Results:

The asymmetric unit of the title compound, C18H18N2O4, comprises half a molecule, with the full molecule generated by an inversion center.
Strong pi-pi interactions were identified between adjacent molecules in the crystal lattice.
The centroid-centroid distance for these pi-pi interactions was measured at 3.298(2) Å, indicating significant overlap.

Conclusions:

The crystal structure of C18H18N2O4 is characterized by a centrosymmetric arrangement.
Strong pi-pi stacking interactions are a dominant feature, influencing the overall molecular assembly.
These findings contribute to the understanding of structure-property relationships in organic crystalline materials.