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[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction01:16

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

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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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Cycloaddition Reactions: Overview01:16

Cycloaddition Reactions: Overview

3.3K
Cycloadditions are one of the most valuable and effective synthesis routes to form cyclic compounds. These are concerted pericyclic reactions between two unsaturated compounds resulting in a cyclic product with two new σ bonds formed at the expense of π bonds. The [4 + 2] cycloaddition, known as the Diels–Alder reaction, is the most common. The other example is a [2 + 2] cycloaddition.
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Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)

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Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...
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Diels–Alder Reaction Forming Cyclic Products: Stereochemistry01:28

Diels–Alder Reaction Forming Cyclic Products: Stereochemistry

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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

Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry

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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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Cycloaddition Reactions: MO Requirements for Thermal Activation01:16

Cycloaddition Reactions: MO Requirements for Thermal Activation

4.1K
Thermal cycloadditions are reactions where the source of activation energy needed to initiate the reaction is provided in the form of heat. A typical example of a thermally-allowed cycloaddition is the Diels–Alder reaction, which is a [4 + 2] cycloaddition. In contrast, a [2 + 2] cycloaddition is thermally forbidden.
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Updated: Jan 9, 2026

Accessing Valuable Ligand Supports for Transition Metals: A Modified, Intermediate Scale Preparation of 1,2,3,4,5-Pentamethylcyclopentadiene
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Diene-Capped Carbene: Pathways to Cycloaddition, Copolymerization, and Catalysis.

Mamak Bakhtiari1, Ludwig Zapf1, Tanja Kunz1

  • 1Department of Chemistry, University of Alberta, 11227 Saskatchewan Dr., Edmonton, Alberta T6G 2G2, Canada.

Journal of the American Chemical Society
|December 10, 2025
PubMed
Summary
This summary is machine-generated.

A novel diene-capped carbene (DECC) was synthesized and functionalized. Its phosphinidene complex enables cycloaddition reactions and forms a natural rubber-type copolymer that acts as a gold-activated alkyne hydration precatalyst.

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Area of Science:

  • Organometallic Chemistry
  • Catalysis
  • Polymer Science

Background:

  • N-heterocyclic carbenes (NHCs) are versatile ligands in organometallic chemistry.
  • Developing novel carbene structures with unique electronic properties is crucial for advancing catalysis.
  • Functionalization of carbene donor sites can lead to new reactive intermediates.

Purpose of the Study:

  • To synthesize and characterize a novel diene-capped carbene (DECC).
  • To investigate the electronic properties and reactivity of the DECC and its functionalized derivatives.
  • To explore the catalytic applications of the resulting complexes and polymers.

Main Methods:

  • Synthesis of DECC via oxidation/double-deprotonation of an NHC precursor.
  • Functionalization of the DECC with selenium and a phosphinidene ligand.
  • Characterization of the DECC, phosphinidene complex, and resulting copolymer using spectroscopic techniques.
  • Investigation of cycloaddition reactions and anionic copolymerization.
  • Evaluation of the copolymer as a precatalyst for alkyne hydration.

Main Results:

  • Successful synthesis of the unprecedented diene-capped carbene (DECC), DieneIPr.
  • Demonstration of exceptional π-accepting character in functionalized DECC derivatives.
  • The phosphinidene complex underwent diene-localized [4 + 2] cycloaddition with cyclooctyne.
  • Anionic copolymerization of the phosphinidene complex with isoprene yielded a natural rubber-type copolymer.
  • The resulting copolymer, upon gold coordination, demonstrated activity as an alkyne hydration precatalyst.

Conclusions:

  • The developed DECC scaffold offers a unique platform for accessing novel reactive intermediates.
  • The phosphinidene complex derived from DECC exhibits versatile reactivity, including cycloaddition and polymerization.
  • The resulting natural rubber-type copolymer shows promise as a recyclable and active precatalyst for gold-catalyzed alkyne hydration.