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Updated: Jan 13, 2026

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可視光駆動型ジチエニルエテン誘導体の光環化反応：近定量的な変換効率と高速応答

Yangyang Wang¹, Xinliang Zeng¹, Gaoang Wang¹

¹Luoyang Key Laboratory of Green Synthesis and Photofunctional Materials, College of Food and Drug, and College of Chemistry and Chemical Engineering, Luoyang Normal University, Luoyang 471934, China.

The Journal of organic chemistry

|January 6, 2026

まとめ

本研究では、光学的特性が向上した新規ジチエニルエテン（DTE）誘導体を提示する。この新しいDTEは、効率的かつ高速なスイッチングを示し、様々な溶液およびフィルム中で性能を維持するため、光学材料への応用が期待される。

背景:

ジチエニルエテン（DTE）誘導体は、フォトクロミック特性で知られている。
可視光駆動型DTEにおいて、低い反応性と変換効率のために高い効率を達成することは困難である。

結論:

合理的に設計されたDTE誘導体は、大幅に強化されたフォトクロミック特性を示す。
アルケンπブリッジを介した拡張π共役は、性能向上に不可欠である。
このDTE誘導体は、優れたフォトクロミズムと蛍光発光により、機能性光学材料への応用が期待される。

キーワード:

ジチエニルエテンフォトクロミズム光スイッチング光学材料可視光応答

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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.

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.
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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.

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.
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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.