An efficient regeneration of singlet oxygen from 2,5-diphenylfuran endoperoxide produced by a dye-sensitized oxygenation.
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概要
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The maximum quantum yield of 4.5 was evaluated from the kinetic analysis for the Methylene Blue-sensitized oxygenation of 2,5-diphenylfuran, and the contribution of a chain process to produce the furan endoperoxide was suggested. After the photoreaction, the thermolysis of the endoperoxide occurred to regenerate 2,5-diphenylfuran and singlet oxygen and to produce <I>cis</I>-1,2-dibenzoylethylene simultaneously. The activation energy of singlet oxygen recovery was estimated to be 18.5 kcal mol<SUP>−1</SUP>. The reversible conversion of singlet oxygen took place efficiently with thiazine and xanthene dyes. A concerted dissociation of singlet oxygen from the endoperoxide was supposed from the negative value of activation enthropy (−9.8 e.u.) for the reaction.
- 公益社団法人 日本化学会の論文
著者
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Usui Yoshiharu
Department Of Achemistry Faculty Of Science Ibaraki University
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Koike Hiroshi
Department Of Urology Nagaoka Red Cross Hospital
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Kurimura Yoshimi
Department Of Chemistry Faculty Of Science Ibaraki University
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Koike Hiroshi
Department of Chemistry, Faculty of Science, Ibaraki University
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Koike Hiroshi
Department of Chemical Pharmacology, Faculty of Pharmaceutical Sciences, The University of Tokyo
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