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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.

[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...

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...

Stability of Conjugated Dienes

Stability of Conjugated Dienes

Introduction
A comparison of the enthalpies of hydrogenation of dienes reveals that conjugated dienes release less heat on hydrogenation, rendering them more stable than their nonconjugated analogs.

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Updated: Apr 16, 2026

Isolating Free Carbenes, their Mixed Dimers and Organic Radicals

Isolating Free Carbenes, their Mixed Dimers and Organic Radicals

Published on: April 19, 2019

Enediyne dimerization vs Bergman cyclization.

Gebhard Haberhauer¹, Rolf Gleiter², Sven Fabig¹

¹†Institut für Organische Chemie, Universität Duisburg-Essen, Universitätsstrasse 7, D-45117 Essen, Germany.

Organic Letters

|March 11, 2015

Summary

This summary is machine-generated.

Enediyne dimerization to diradicals is more favorable than Bergman cyclization. Electron-withdrawing fluoro groups significantly lower the activation barriers for both enediyne reactions.

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Area of Science:

Organic Chemistry
Computational Chemistry
Reaction Mechanisms

Background:

Enediynes are organic compounds known for their unique reactivity.
Bergman cyclization is a key reaction pathway for enediynes.
Understanding reaction energetics is crucial for synthetic chemistry.

Purpose of the Study:

To investigate the energetic favorability of enediyne dimerization versus Bergman cyclization.
To explore the effect of substituents on the reaction pathways and activation barriers.
To provide insights into the computational prediction of enediyne reactivity.

Main Methods:

High-level quantum chemical calculations were employed.
Density Functional Theory (DFT) or similar methods were used to model reaction pathways.
Energetic profiles and transition states were analyzed.

Main Results:

Enediyne dimerization to 1,3-butadiene-1,4-diyl diradicals is energetically preferred over Bergman cyclization.
Introduction of electron-withdrawing fluoro substituents significantly reduces activation barriers for both pathways.
Computational models accurately predict reaction outcomes.

Conclusions:

Dimerization represents a more favorable reaction pathway for enediynes under studied conditions.
Electron-withdrawing groups offer a viable strategy to control and facilitate enediyne reactions.
Quantum chemical calculations are powerful tools for elucidating complex reaction mechanisms.