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Updated: Jul 4, 2025

Developing Photosensitizer-Cobaloxime Hybrids for Solar-Driven H2 Production in Aqueous Aerobic Conditions
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Developing Photosensitizer-Cobaloxime Hybrids for Solar-Driven H2 Production in Aqueous Aerobic Conditions

Published on: October 5, 2019

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二相電解質におけるブロム進化反応による高度選択的タンデム光電化学C-H活性化

Sang Youn Chae1,2, Adeel Mehmood1, Eun Duck Park1,3

  • 1Department of Energy System Research, Ajou University, Suwon 16499, Republic of Korea.

Journal of the American Chemical Society
|February 6, 2024
PubMed
まとめ

この研究は,再生可能エネルギーを用いた選択的ブロミネーションのための新しい光電気化学的方法を示しています. タンタール窒素光電極は,環境に優しい化学合成のためにブロムを効率的に生成しました.

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Photogeneration of N-Heterocyclic Carbenes: Application in Photoinduced Ring-Opening Metathesis Polymerization12:19

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Photochemical Electrocyclic Reactions: Stereochemistry

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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Consider the bromination of cyclopentene. Molecular bromine is polarized in the proximity of the π electrons of cyclopentene. An electrophilic bromine atom adds across the double bond, forming a cyclic bromonium ion intermediate.
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