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Photochemical Electrocyclic Reactions: Stereochemistry01:26

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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.
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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.
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Birch reduction uses solvated electrons as reducing agents. The reaction converts benzene to 1,4-cyclohexadiene. The reaction proceeds by the transfer of a single electron to the ring to form a benzene radical anion. This anion is highly basic—it abstracts a proton from the alcohol to form a cyclohexadienyl radical. Another single electron transfer gives the cyclohexadienyl anion. A proton transfer from the alcohol forms 1,4-cyclohexadiene. Since this reduction occurs via radical anion...
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Electrocyclic reactions, cycloadditions, and sigmatropic rearrangements are concerted pericyclic reactions that proceed via a cyclic transition state. These reactions are stereospecific and regioselective. The stereochemistry of the products depends on the symmetry characteristics of the interacting orbitals and the reaction conditions. Accordingly, pericyclic reactions are classified as either symmetry-allowed or symmetry-forbidden. Woodward and Hoffmann presented the selection criteria for...
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The reaction of weakly electrophilic aryldiazonium (also called arenediazonium) salts with highly activated aromatic compounds leads to the formation of products with an —N=N— link, called an azo linkage. This reaction, presented in Figure 1, is known as diazo coupling and occurs without the loss of the nitrogen atoms of the aryldiazonium salt. Highly activated aromatic compounds such as phenols or arylamines favor the diazo coupling reaction. The coupling generally occurs at the para...
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In an electrophilic aromatic substitution reaction, an electrophile substitutes for a hydrogen of an aromatic compound.
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Photoswitches beyond azobenzene: a beginner's guide.

Michela Marcon1, Christoph Haag1, Burkhard König1

  • 1Institute of Organic Chemistry, University of Regensburg, Universitätsstr. 31, 93053 Regensburg, Germany.

Beilstein Journal of Organic Chemistry
|September 17, 2025
PubMed
Summary

This tutorial review introduces photoswitches beyond famous azobenzenes. It explores the synthesis, mechanisms, and properties of seven diverse photoswitch classes for tailored applications.

Keywords:
photoswitch propertiesphotoswitchesswitching mechanismssynthesis of photoswitchestutorial review

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Area of Science:

  • Photochemistry
  • Organic Chemistry
  • Materials Science

Background:

  • Photoswitches are molecules that change properties upon light irradiation.
  • Azobenzene is a well-known photoswitch, but other classes offer unique tunable characteristics.
  • Understanding diverse photoswitch classes is crucial for advancing molecular technologies.

Purpose of the Study:

  • To provide a comprehensive tutorial on photoswitches for students and researchers.
  • To introduce key terminology, synthesis, switching mechanisms, and properties of various photoswitch classes.
  • To highlight photoswitch alternatives to azobenzene for specialized applications.

Main Methods:

  • Literature review and synthesis of existing knowledge on photoswitches.
  • Detailed explanation of terminology and concepts in photoswitch research.
  • Comparative analysis of seven distinct photoswitch classes: azoheteroarenes, diazocines, indigoid photoswitches, arylhydrazones, diarylethenes, fulgides, and spiropyrans.

Main Results:

  • Azobenzene is not the only photoswitch; several other classes exhibit valuable and tunable properties.
  • Seven specific photoswitch classes (azoheteroarenes, diazocines, indigoid photoswitches, arylhydrazones, diarylethenes, fulgides, spiropyrans) are detailed.
  • The review covers synthesis routes, light-induced switching mechanisms, and characteristic properties for each class.

Conclusions:

  • This review serves as an accessible entry point into the diverse world of photoswitches.
  • It empowers readers to select and utilize appropriate photoswitch classes based on specific requirements.
  • Exploring photoswitches beyond azobenzene opens new avenues for molecular design and functional materials.