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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: 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,...

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 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.

Structure of Conjugated Dienes

Structure of Conjugated Dienes

Introduction
Conjugated dienes are compounds characterized by the presence of alternating double and single bonds. In a conjugated system like 1,3-butadiene, the unhybridized 2p orbital on each carbon overlaps continuously, allowing the π electrons to be delocalized across the entire molecule. In contrast, this type of overlap does not occur in cumulated and isolated dienes, such as 2,3-pentadiene and 1,4-pentadiene, respectively. Instead, the π electrons remain localized between the double...

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.

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Updated: Jan 15, 2026

Electroactive Polymer Nanoparticles Exhibiting Photothermal Properties

Electroactive Polymer Nanoparticles Exhibiting Photothermal Properties

Published on: January 8, 2016

A Crystalline Monomeric Diboryl Diazene.

Fengbo Huang^1,2, Xin-Feng Wang¹, Baixu Ma¹

¹Department of Chemistry and Research Center for Chemical Biology and Omics Analysis, College of Science, Southern University of Science and Technology, Shenzhen 518055, China.

Journal of the American Chemical Society

|October 10, 2025

Summary

Researchers synthesized and characterized isolable monomeric diboryl diazenes, revealing their potential as versatile platforms. These compounds enable controlled access to boryl radicals and offer insights into nitrogen (N₂) reduction chemistry.

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Area of Science:

Main group chemistry
Organoboron chemistry
Nitrogen chemistry

Background:

Azo compounds are fundamental nitrogen-containing molecules.
Monomeric diboryl diazenes were previously elusive, presumed to be unstable intermediates or polymers.

Purpose of the Study:

To synthesize and characterize an isolable monomeric diboryl diazene.
To investigate the reactivity of this novel compound with various substrates.

Main Methods:

Synthesis of Mes₂BN═NBMes₂ (2).
Characterization using spectroscopic and analytical techniques.
Reactivity studies with Lewis bases and N-H containing compounds.

Main Results:

Isolation and characterization of a monomeric diboryl diazene with a B═N═N═B core.
Lewis basic substrates induced N₂ extrusion, generating Mes₂B• radicals.
Ammonia and ethylamine triggered cooperative N-H bond activation without radical formation.

Conclusions:

Diboryl diazenes are versatile main group platforms.
Enables controllable generation of boryl radicals.
Provides insights into nitrogen (N₂) reduction pathways.