Substituent effects on dissociation constants of trans-3-hydroxy-6-styryl-4-pyrones.
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概要
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The dissociation constants of 6-substituted 3-hydroxy-4-pyrones and <I>trans</I>-6-(substituted styryl)-3-hydroxy-4-pyrones were measured spectrophotometrically in 50% aqueous methanol at 25 °C. The results are correlated to the substituent constants σ, the following equations being obtained: p<I>K</I><SUB>a</SUB>=8.57–1.53 σ and p<I>K</I><SUB>a</SUB>=8.54–0.23 σ. The transmission coefficient through the styryl group was found to be 0.150 for the 3-hydroxy-6-styryl-4-pyrone system.
- 公益社団法人 日本化学会の論文
著者
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IMAFUKU Kimiaki
Department of Chemistry, Faculty of Science, Kumamoto University
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Besso Hiromichi
Department of Chemistry, Faculty of Science, Kumamoto University
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