The kinetic evidence of the concerted[1,9]sigmatropy for the acetyl migration in the 2-acetoxytropones. The NMR spectral analysis of the seven-fold degenerated acetotropy of hexaacetoxytropone.

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概要

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• "The acetotropy" of 2-acetoxytropones was shown to be a concerted [1,9] sigmatropic process on the basis of a kinetic analysis. A little substituent effect for the activation free energy of the acetyl migration was recognized. Preferred tautomers of polyacetoxytropones were those having the carbonyl group at inner positions. As an extreme case, a "Merry-Go-Round"-type rearrangement was operative in hexaacetoxytropone.

• 公益社団法人 日本化学会の論文

著者

• Takeshita Hitoshi

  Institute Of Advanced Material Study 86 Kyushu University

• Mori Akira

  Institute For Materials Chemistry And Engineering Kyushu University

• Sugiyama Shigeru

  Institute of Advanced Material Study, 86, Kyushu University

• Kodama Mitsuaki

  Pharmaceutical School of Tokushima Bunri University

• Kusaba Tomoyuki

  Graduate School of Engineering Sciences, 39, Kyushu University

• Watanabe Hiroyasu

  Graduate School of Engineering Sciences, 39, Kyushu University

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