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Related Concept Videos

Cycloaddition Reactions: MO Requirements for Photochemical Activation01:12

Cycloaddition Reactions: MO Requirements for Photochemical Activation

Some cycloaddition reactions are activated by heat, while others are initiated by light. For example, a [2 + 2] cycloaddition between two ethylene molecules occurs only in the presence of light. It is photochemically allowed but thermally forbidden.
Cycloaddition Reactions: MO Requirements for Thermal Activation01:16

Cycloaddition Reactions: MO Requirements for Thermal Activation

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

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 Reaction01:16

[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.
Cycloaddition Reactions: Overview01:16

Cycloaddition Reactions: Overview

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

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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Related Experiment Video

Updated: Jul 2, 2026

Microwave-assisted Intramolecular Dehydrogenative Diels-Alder Reactions for the Synthesis of Functionalized Naphthalenes/Solvatochromic Dyes
12:07

Microwave-assisted Intramolecular Dehydrogenative Diels-Alder Reactions for the Synthesis of Functionalized Naphthalenes/Solvatochromic Dyes

Published on: April 1, 2013

Visible Light-Induced Intermolecular Dearomatization for Constructing Angularly Fused Tetracyclic Scaffolds.

Fan Lin1,2, Ting-Ting Song3, Li-Ming Zhang1,4

  • 1Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian, 116023, China.

Nature Communications
|June 30, 2026
PubMed
Summary
This summary is machine-generated.

Visible light photocatalysis enables dearomative cycloaddition, efficiently creating complex angularly fused tetracyclic scaffolds from simple aromatic precursors like benzothiophenes and indoles.

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Light-driven Molecular Motors on Surfaces for Single Molecular Imaging
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Last Updated: Jul 2, 2026

Microwave-assisted Intramolecular Dehydrogenative Diels-Alder Reactions for the Synthesis of Functionalized Naphthalenes/Solvatochromic Dyes
12:07

Microwave-assisted Intramolecular Dehydrogenative Diels-Alder Reactions for the Synthesis of Functionalized Naphthalenes/Solvatochromic Dyes

Published on: April 1, 2013

Atom Transfer Radical Polymerization of Functionalized Vinyl Monomers Using Perylene as a Visible Light Photocatalyst
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Light-driven Molecular Motors on Surfaces for Single Molecular Imaging
08:40

Light-driven Molecular Motors on Surfaces for Single Molecular Imaging

Published on: March 13, 2019

Area of Science:

  • Organic Chemistry
  • Photocatalysis
  • Synthetic Methodology

Background:

  • Visible light photocatalysis is a powerful strategy for synthesizing complex polycyclic frameworks.
  • Angularly fused polycyclic systems are crucial scaffolds in pharmaceuticals and natural products.

Purpose of the Study:

  • To develop a robust photocatalytic protocol for assembling angularly fused tetracyclic scaffolds.
  • To explore the intermolecular dearomatization of benzothiophene/indole derivatives with N-aryl cyclopropylamines.

Main Methods:

  • Utilizing visible light photocatalysis for dearomative cycloaddition.
  • Employing a cascade reaction involving [3+2] cycloaddition and cyclization.
  • Reacting benzothiophene/indole derivatives with N-aryl cyclopropylamines.

Main Results:

  • Successfully synthesized angularly fused tetracyclic scaffolds.
  • Demonstrated a novel photocatalytic intermolecular dearomative [3+2] cycloaddition process.
  • Achieved direct access to structurally diverse tetracyclic cores.

Conclusions:

  • The developed protocol offers a direct and efficient route to complex tetracyclic structures.
  • This work highlights the synthetic utility of photocatalytic dearomative cycloadditions.
  • Provides a valuable tool for accessing privileged scaffolds in medicinal chemistry.