The 1-Methylene Derivatives of [7](2,6)Pyridinophane. Preparative and Conformational Studies
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概要
- 論文の詳細を見る
The 1-<I>exo</I>-methylene derivatives (IV, V and VII) of [7](2,6)pyridinophane (I) are synthesized by Wittig's reaction of [7](2,6)pyridinophan-1-one (III) or by the dehydration of the corresponding carbinol (VI). The C-4 protons are all shielded magnetically to varying extents, depending on their respective 1-substituents. The shielding effect is ascribed to the anisotropy of the pyridine ring. The signals of the C-4 protons are temperature-dependent, and the energy barriers for the conformational changes are estimated to be 8.7 for III, 9.1 for IV, 9.1 for V and 9.8 kcal/mol for VII.
- 公益社団法人 日本化学会の論文
著者
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FUJITA Shinsaku
Department of Chemistry and Materials Technology, Kyoto Insititute of Technology
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Nozaki Hitosi
Department of Industrial Chemistry, Faculty of Engineering Kyoto University
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Imamura Kazuo
Department of Industrial Chemistry, Kyoto University
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