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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

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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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Cycloaddition Reactions: Overview01:16

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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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Woodward–Hoffmann Selection Rules and Microscopic Reversibility01:34

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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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Enhancing tetraphenylethene cyclization as photoswitch.

Yue Wu1, Yiran Ren1, Xiaoxuan Zeng1

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Smart Molecules : Open Access
|July 8, 2025
PubMed
Summary

Tetraphenylethene (TPE) photocyclization is enhanced by adding carbonate esters, significantly increasing stability. This breakthrough allows for visible monitoring and new applications in optical information encoding.

Keywords:
aggregation‐induced emissiondiarylethenephotocyclizationphotoswitchtetraphenylethene

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Area of Science:

  • Materials Science
  • Organic Chemistry
  • Photochemistry

Background:

  • Tetraphenylethene (TPE) exhibits aggregation-induced emission but its photochromic properties are limited by rapid cycloreversion.
  • Achieving stable and visible photocyclization of TPE remains a significant challenge for its applications.

Purpose of the Study:

  • To enhance the photocyclization stability of Tetraphenylethene (TPE).
  • To develop TPE-based materials with visually monitored photochromic behavior.

Main Methods:

  • Synthesized TPE derivative (TPE-4C) by attaching carbonate ester groups to the TPE skeleton.
  • Investigated the photocyclization stability and lifetime of the TPE-4C intermediate.
  • Explored the photochromic response and fatigue resistance of TPE-4C.
  • Encapsulated TPE-4C into liquid crystals to observe phase transformations.

Main Results:

  • The carbonate ester substituents in TPE-4C significantly increased the energy barrier for cycloreversion, enhancing photocyclization stability.
  • The lifetime of the photocyclic intermediate was prolonged from picoseconds to 46 seconds (a 7.2 × 10^11-fold increase).
  • Photoinduced cyclization of TPE-4C was visually observable and reversible with UV light, showing good fatigue resistance.
  • Encapsulation of TPE-4C in liquid crystals induced an achiral↔chiral phase transformation, enabling optical information encoding.

Conclusions:

  • Incorporating carbonate esters into TPE is a viable strategy to dramatically improve photocyclization stability.
  • The enhanced stability enables visually monitored TPE photocyclization, opening new avenues for TPE-based applications.
  • TPE-4C's ability to induce liquid crystal phase transformations offers potential for optical data storage.