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Related Concept Videos

Cycloaddition Reactions: MO Requirements for Photochemical Activation01:12

Cycloaddition Reactions: MO Requirements for Photochemical Activation

2.2K
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.
2.2K
Cycloaddition Reactions: Overview01:16

Cycloaddition Reactions: Overview

2.9K
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.
2.9K
Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

1.9K
The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
1.9K
Cycloaddition Reactions: MO Requirements for Thermal Activation01:16

Cycloaddition Reactions: MO Requirements for Thermal Activation

3.8K
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.
3.8K
Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

2.5K
Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
2.5K
Thermal Electrocyclic Reactions: Stereochemistry01:17

Thermal Electrocyclic Reactions: Stereochemistry

2.1K
The stereochemistry of electrocyclic reactions is strongly influenced by the orbital symmetry of the polyene HOMO. Under thermal conditions, the reaction proceeds via the ground-state HOMO.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
2.1K

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Updated: Sep 29, 2025

Microwave-assisted Intramolecular Dehydrogenative Diels-Alder Reactions for the Synthesis of Functionalized Naphthalenes/Solvatochromic Dyes
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Wavelength-Selective Photo-Cycloadditions of Styryl-Anthracene.

Jing Bai1, Zixing Shi1, Xiaodong Ma1

  • 1School of Chemistry & Chemical Engineering, Frontiers Science Center for Transformative Molecules, State Key Laboratory for Metal Matrix Composite Materials, Shanghai Jiao Tong University, Shanghai, 200240, P. R. China.

Macromolecular Rapid Communications
|March 26, 2022
PubMed
Summary

Styryl-anthracene carboxylic acid (SACA) exhibits wavelength-selective photocycloaddition. Visible light triggers reversible [2+2] reactions, while UV light induces irreversible [2+4] reactions, enabling smart material applications.

Keywords:
UV lightphoto-cycloadditionstyryl-anthracenevisible lightwavelength-selectivity

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Area of Science:

  • Photochemistry
  • Materials Science
  • Organic Chemistry

Background:

  • Light-tunable covalent chemistry is crucial for spatiotemporal control in smart materials.
  • Developing reversible and wavelength-selective chemical reactions is a key challenge.

Purpose of the Study:

  • To report a novel wavelength-selective photocycloaddition reaction using styryl-anthracene carboxylic acid (SACA).
  • To explore the potential applications of this light-tunable chemistry in advanced materials.

Main Methods:

  • Investigated the photocycloaddition reactions of SACA under different light wavelengths (450 nm visible light and 365 nm UV light).
  • Characterized the reversibility of the [2+2] photocycloaddition and the stability of the resulting dimer.

Main Results:

  • SACA undergoes wavelength-selective [2+2] photocycloaddition with 450 nm visible light and [2+4] photocycloaddition with 365 nm UV light.
  • The [2+2] photocycloaddition is reversible by 365 nm UV light, forming a stable dimer-24.
  • Demonstrated potential applications in self-assembly, dynamic wrinkles, and fluorescence patterns.

Conclusions:

  • SACA offers a versatile platform for light-tunable covalent chemistry.
  • The reversible and selective nature of SACA photocycloaddition enables dynamic control over material properties.
  • This chemistry holds promise for developing advanced smart materials and surfaces.