A Study on the Photochemistry of α,β-Unsaturated γ-Lactones. II. Photoisomerization of 3-Ethylidene-4,5-dihydro-2(3<I>H</I>)-furanone
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概要
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On irradiation of <I>cis</I>-3-ethylidene-4,5-dihydro-2(3<I>H</I>)-furanone with 2537 Å light, both the <I>cis-trans</I> isomerization of the exocyclic double bond and transformation into the β,γ-unsaturated isomer, 3-vinyl-4,5-dihydro-2(3<I>H</I>)-furanone, were observed. By the use of sensitizers such as acetone, acetophenone, <I>p</I>-methoxyacetophenone and benzophenone, it was possible to induce <I>cis-trans</I> isomerization exclusively. On the basis of the solvent effect and the wavelength dependence of the reactions, transformation into the β, γ-unsaturated isomer and <I>cis-trans</I> isomerization were suggested to proceed <I>via</I> T<SUB>2</SUB>(<I>n</I>,π<SUP>*</SUP>) and T<SUB>1</SUB>(<I>n</I>,π) states, respectively.
- 公益社団法人 日本化学会の論文
著者
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Matsuo Taku
Department Of Chemical Science And Technology Faculty Of Engineering Kyushu University
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Ohga Kazuya
Department Of Applied Chemistry Faculty Of Engineering Oita University
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