Crystal Structure of Fukinolidol Di-Bromoacetate

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概要

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• Fukinolidol di-bromoacetate, C<SUB>19</SUB>H<SUB>24</SUB>O<SUB>6</SUB>Br<SUB>2</SUB>, is a derivative of the new sesquiterpenoids isolated from the flower stalks of wild butterburs. The crystal of this derivative is monoclinic, with two molecules in a unit cell with dimensions of <I>a</I>=17.13, <I>b</I>=8.21, <I>c</I>=7.59 Å, and β=98.8°, and with the space group <I>P</I>2<SUB>1</SUB>. The structure was elucidated by the heavy-atom method, and the absolute configuration was determined by the application of the anomalous dispersion effect of bromine. The atomic parameters were refined by the least-squares method, using a block-diagonal approximation. The structure thus obtained is the same as that shown by the organic chemical investigation which was carried out parallel with the present X-ray analysis. The molecule has a novel bicyclononane structure with a <I>cis</I>-fused system of a five-membered and a six-membered ring; it also has a spiro γ-lactone ring connected to the former ring. The lactone ring is almost planar, and the other five-membered ring takes a typical envelope conformation, while the six-membered ring is of the chair form.

• 公益社団法人 日本化学会の論文

著者

• Nitta Isamu

  Faculty Of Science Osaka University

• Naya Keizo

  Faculty of Science, Kwansei Gakuin University

• Katayama Chuji

  Faculty of Science, Kwansei Gakuin University

• Furusaki Akio

  Faculty of Science, Kwansei Gakuin University

• Hayashi Mitsuo

  Faculty of Science, Kwansei Gakuin University

• Nitta Isamu

  Faculty of Science, Kwansei Gakuin University

関連論文

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• Crystal Structure of Fukinolidol Di-Bromoacetate
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• The Crystal and Molecular Structure of Demycarosyl Leucomycin A3 Hydrobromide
• The crystal and molecular structure of albocycline.

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