Photochemical reactions between dibromomaleic anhydride and benzo[b]thiophene.

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概要

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• On the irradiation of dibromomaleic anhydride in the presence of benzo[<I>b</I>]thiophene, both photosubstitution and photocycloaddition are simultaneously induced. The ratio of the substituted product to the cycloadduct increased with solvent polarity, and the same Stern-Volmer plots were obtained with both of the reactions. Kinetic parameters, obtained under various concentrations of benzo[<I>b</I>]thiophene, indicate that the reactions proceed <I>via</I> a common triplet exciplex. The activation energy for the photosubstitution is higher than that for the cycloaddition by 1–2 kcal/mol, where the former reaction is considered to proceed <I>via</I> a more polar transition state than the latter.

• 公益社団法人 日本化学会の論文

著者

• Mihara Satoru

  Department of Organic Synthesis, Faculty of Engineering, Kyushu University

関連論文

• Photochemical reactions between dibromomaleic anhydride and V-phenylpyrrole.
• Photochemical reactions between dibromomaleic anhydride and benzo[b]thiophene.

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