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A part of this work has been published in a preliminary communication: Abe H., Itani J., Masunari C., Kashino S., Harayama T., J. Chem. Soc., Chem. Commun., 1995, 1197-1198.
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Although no minor oxathiane was detected in the reaction with 4, the relative configuration of 28 was elucidated as depicted in Table 2, based upon studies on the conformational features of 1,3-oxathiane derivatives. Since it has been documented that 2-alkylated-1,3-oxathianes generally exist in a chair conformation, the 2-alkyl group should be in equatorial direction, in order to avoid steric interaction. a) Gelan J., Anteunis M., Bull. Soc. Chim. Belges, 77, 423-432 (1968); b) Idem, ibid., 77, 447-454 (1968); c) Pasanen P., Pihlaja K., Tetrahedron, 28, 2617-2626 (1972).
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84980081134
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Although no minor oxathiane was detected in the reaction with 4, the relative configuration of 28 was elucidated as depicted in Table 2, based upon studies on the conformational features of 1,3-oxathiane derivatives. Since it has been documented that 2-alkylated-1,3-oxathianes generally exist in a chair conformation, the 2-alkyl group should be in equatorial direction, in order to avoid steric interaction. a) Gelan J., Anteunis M., Bull. Soc. Chim. Belges, 77, 423-432 (1968); b) Idem, ibid., 77, 447-454 (1968); c) Pasanen P., Pihlaja K., Tetrahedron, 28, 2617-2626 (1972).
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0001380870
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Although no minor oxathiane was detected in the reaction with 4, the relative configuration of 28 was elucidated as depicted in Table 2, based upon studies on the conformational features of 1,3-oxathiane derivatives. Since it has been documented that 2-alkylated-1,3-oxathianes generally exist in a chair conformation, the 2-alkyl group should be in equatorial direction, in order to avoid steric interaction. a) Gelan J., Anteunis M., Bull. Soc. Chim. Belges, 77, 423-432 (1968); b) Idem, ibid., 77, 447-454 (1968); c) Pasanen P., Pihlaja K., Tetrahedron, 28, 2617-2626 (1972).
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TEXSAN-TEXRAY Structure Analysis Package, Molecular Structure Corporation, 3200 Research Forest Drive, The Woodlands, Texas 77381, U.S.A.
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