Stereoselective formation of rotaxanes composed of polymethylenebridged dinuclear cobalt(III) complexes and .ALPHA.- or .BETA.-cyclodextrin.

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概要

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• [2]-[[(en)<SUB>2</SUB>Co{NH<SUB>2</SUB>(CH<SUB>2</SUB>)<SUB>2</SUB>S(CH<SUB>2</SUB>)<I><SUB>n</SUB></I>S(CH<SUB>2</SUB>)<SUB>2</SUB>NH<SUB>2</SUB>}Co(en)<SUB>2</SUB>]Cl<SUB>6</SUB>]-[α- or β-CDX]-rotaxanes were prepared with partial stereoselectivity and characterized from their absorption and <SUP>13</SUP>C NMR spectra, molar conductance, and elemental analysis (CDX=cyclodextrin; <I>n</I>=8, 10, and 12). The rotaxanes always showed apparently <I>ΔΔ</I>-rich. CD spectra, the highest selectivity (16% <I>ΔΔ</I>-rich) being found in the case of <I>n</I>=10 and α-CDX. The results are related to the direct preparation of [2]-[<I>ΔΔ</I>-[(en)<SUB>2</SUB>Co{NH<SUB>2</SUB>(CH<SUB>2</SUB>)<SUB>2</SUB>S(CH<SUB>2</SUB>)<I><SUB>n</SUB></I>S(CH<SUB>2</SUB>)<SUB>2</SUB>NH<SUB>2</SUB>}Co(en)<SUB>2</SUB>]Cl<SUB>6</SUB>]-[α-CDX]-rotaxanes (<I>n</I>=8, 10, and 12) in relatively higher yields than the corresponding <I>ΛΛ</I> rotaxanes: 3.5% for <I>n</I>=8, 21% for <I>n</I>=10, and 28% for <I>n</I>=12. Inclusion complexes of a new type [Co(en)<SUB>2</SUB>{NH<SUB>2</SUB>(CH<SUB>2</SUB>)<SUB>2</SUB>S(CH<SUB>2</SUB>)<I><SUB>n</SUB></I>Br}]Cl<SUB>3</SUB>·2(α-CDX) were also isolated (<I>n</I>=10 and 12).

• 公益社団法人 日本化学会の論文

著者

• Yamanari Kazuaki

  Department Of Chemisry Faculty Of Science Osaka University

• Shimura Yoichi

  Department of Chemistry Faculty of Science Osaka University

• Yamanari Kazuaki

  Department of Chemistry, Faculty of Science, Osaka University Toyonaka

関連論文

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