1980
DOI: 10.1002/cber.19801131225
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2,5‐Dioxabicyclo[2.2.2]octan‐Derivate: Konformation von Methyl‐2,6‐anhydro‐α‐ D ‐hexopyranosiden

Abstract: 2,5-Dioxabicyclo[2.2.2]octane Derivatives: Conformation of Methyl 2,6-Aahydro-a-~-hexopyranosidesRing opening of methyl 2,6: 3,4-dianhydro-a-~-altropyranoside (5) with KOH in water at 150 "C yields almost exclusively the hitherto unknown methyl 2,6-anhydro-a-n-rnannopyranoside (a). 'H NMR spectra of this compound and of all other a-anomers of this series suggest a conformation of the pyranose ring intermediate between the boat ','B(D) and the twist boat 'S, (D). This was verified by X-ray analysis of methyl 3 … Show more

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Cited by 12 publications
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