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Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

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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.
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Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

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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.
Selection Rules: Photochemical Activation
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Cycloaddition Reactions: MO Requirements for Photochemical Activation01:12

Cycloaddition Reactions: MO Requirements for Photochemical Activation

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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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Thermal Electrocyclic Reactions: Stereochemistry01:17

Thermal Electrocyclic Reactions: Stereochemistry

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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.
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Pericyclic Reactions: Introduction01:17

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Pericyclic reactions are organic reactions that occur via a concerted mechanism without generating any intermediates. The reactions proceed through the movement of electrons in a closed loop to form a cyclic transition state, where rearrangement of the σ and π bonds yields specific products.
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The light reactions of photosynthesis assume a linear flow of electrons from water to NADP+. During this process, light energy drives the splitting of water molecules to produce oxygen. However, oxidation of water molecules is a thermodynamically unfavorable reaction and requires a strong oxidizing agent. This is accomplished by the first product of light reactions: oxidized P680 (or P680+), the most powerful oxidizing agent known in biology. The oxidized P680 that acquires an electron from the...
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Synergizing Electrons and Photons in Motion: Continuous-Flow Implementation in Electro- and Photocatalyzed C-H

Sven Erik Peters1, Tristan von Münchow1, Lutz Ackermann1

  • 1Wöhler Research Institute for Sustainable Chemistry (WISCh), Georg-August-Universität Göttingen, 37077 Göttingen, Germany.

JACS Au
|February 27, 2026
PubMed
Summary

Continuous-flow technology offers a sustainable and efficient method for molecular synthesis, particularly for C-H functionalization. This approach enhances reaction control, enabling the creation of complex molecules from simple starting materials.

Keywords:
Continuous-FlowCH FunctionalizationElectrochemistryEnantioselective CatalysisPhotochemistryPhotoelectrocatalysis

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Area of Science:

  • Organic Chemistry
  • Chemical Engineering
  • Sustainable Chemistry

Background:

  • Conventional batch processes face limitations in temperature and residence time control.
  • C-H functionalization offers a pathway to synthesize complex molecules from abundant resources.
  • Flow chemistry provides enhanced heat and mass transfer, accelerating reactions.

Purpose of the Study:

  • To explore the potential of continuous-flow technology for resource-economical molecular synthesis.
  • To leverage C-H functionalization for step- and atom-economical access to value-added molecular architectures.
  • To demonstrate the advantages of flow reactors in terms of safety, sustainability, and scalability.

Main Methods:

  • Application of continuous-flow reactors for molecular synthesis.
  • Utilizing C-H bonds as latent functional groups for targeted transformations.
  • Integration of photo-, electro-, and photoelectrocatalysis within flow systems.

Main Results:

  • Flow chemistry enables superior control over reaction parameters like temperature and residence time.
  • Enhanced heat and mass transfer in flow reactors lead to accelerated kinetics.
  • Continuous-flow systems facilitate safe, scalable, and sustainable chemical transformations.
  • Earth-abundant catalysts and renewable solvents are effectively utilized.

Conclusions:

  • Continuous-flow technology is a powerful platform for efficient and sustainable molecular synthesis.
  • C-H functionalization in flow chemistry provides a streamlined route to complex molecules.
  • Flow chemistry, especially when combined with catalysis, offers significant advantages over traditional batch methods.