Implications of X-ray crystallographic results of 1,2,3,4-tetrachloro-9-(2-oxopropyl)triptycene rotamers.
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概要
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Crystals of 1,2,3,4-tetrachloro-9-(2-oxopropyl)triptycene grown from tetrahydrofuran-hexane were found to contain 1:1 <I>ap</I> and ±<I>sc</I> rotational isomers about the C<SUB>9</SUB>–C<SUB>Pr</SUB> bond by the X-ray diffraction method. The molecular structures had the following features. The acetyl group in the 9-substituent takes an <I>O</I>-inside, relative to the triptycene skeleton, conformation in both forms. The benzene rings are deformed by the steric effect to form boats. The 2-oxopropyl groups in both forms were planar within the experimental error but the C<SUB>2</SUB>–C<SUB>1</SUB> bond in the 2-oxopropyl group was appreciably shorter in the ±<I>sc</I> conformation than that in the <I>ap.</I> The results are discussed on the ground of steric repulsion and the existence of the interaction between the C=O and the Cl groups which are located only 3.035 Å apart in the ±<I>sc</I> form.
- 公益社団法人 日本化学会の論文
著者
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Oki Michinori
Department Of Chemistry Faculty Of Science Okawama University Of Science
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Sato Shoichi
Institute For Solid State Physics The University Of Tokyo
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Saito Yoshihiko
Institute for Solid State Physics The University of Tokyo
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Saito Yoshihiko
Institute for Solid State Physics, The University of Tokyo
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Nogami Norimasa
Department of Chemistry, Faculty of Science, The University of Tokyo
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