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Updated: Jan 10, 2026

Atom Transfer Radical Polymerization of Functionalized Vinyl Monomers Using Perylene as a Visible Light Photocatalyst
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Atom Transfer Radical Polymerization of Functionalized Vinyl Monomers Using Perylene as a Visible Light Photocatalyst

Published on: April 22, 2016

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纳米封闭的光催化级联反应在烯连接的共价有机框架

Qiujian Xie1, Anqi Chen1, Wen Li1

  • 1College of Chemistry and Chemical Engineering, Central South University, Changsha, Hunan, 410083, China.

Angewandte Chemie (International ed. in English)
|November 28, 2025
PubMed
概括

这项研究引入了一种新的纳米封闭式光催化系统,使用富含的2D-COFs进行选择性醇合成. 该系统在有氧氧化过程中实现了高产量和选择性,克服了反应性中间体的挑战.

关键词:
共价有机框架是共价有机框架.纳米封闭是指纳米封闭.摄影级联催化剂的催化剂选择性氧化是一种选择性氧化.

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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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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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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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