ESR and ENDOR studies of cation radicals derived from benzodipyran compounds. Structure and dynamic behavior of heterocyclic ring in tocopherol (vitamin E).
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概要
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ESR and ENDOR spectra of cation radicals of benzodipyran compounds were measured in CH<SUB>2</SUB>Cl<SUB>2</SUB>, and the proton hyperfine coupling constants were correctly determined for each radical. From detailed analysis of the temperature dependence of hyperfine coupling of β- and γ-methylene protons in the heterocyclic ring, the equilibrium conformation of the β-methylene group and activation energy for the conformational interconversion have been determined. The structure of the heterocyclic ring was compared with those of α-tocopherol (vitamin E) model previously obtained by X-ray analysis. The result suggests that the solution and crystal conformations of the heterocyclic ring are distinctly different.
- 公益社団法人 日本化学会の論文
著者
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Mukai Kazuo
Department Of Chemistry Faculty Of Science Ehime University
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Ishizu Kazuhiko
Department Of Chemistry Faculty Of Science Ehime University
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ISHIZU KAZUHIKO
Department of Chemistry, Faculty of Science, Ehime University
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Uemoto Yuichi
Department of Chemistry, Faculty of Science, Ehime University
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