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Crystal and molecular structure of methyl 3,4-anhydro-a-dl-allopyranoside: ring conformations in the 3,4-anhydropyranose system

✍ Scribed by Janusz W. Krajewski; Przemysław Gluziński; Anna Banaszek

Publisher
Elsevier Science
Year
1990
Tongue
English
Weight
515 KB
Volume
203
Category
Article
ISSN
0008-6215

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✦ Synopsis

X-Ray diffractometry of methyl 3,4-anhydro-a-nL-allopyranoside (3) revealed the crystals to be monoclinic, space group Cc, with cell dimensions a = 6242(l), b = 16.987(2), c = 7.739(l) A; /I = 106.09(l)", Z = 4. The 3,4_anhydropyranose ring adopts a hybrid 'E + '&conformation. Relatively strong intermolecular hydrogen bonds were observed. * Lists of structure factors, hydrogen coordinates, and anisotropic thermal parameters have been deposited with, and can be obtained from, Elsevier Science Publishers B.V., BBA Data Deposition, P.O. Box 1527, Amsterdam, The Netherlands. Reference should be made to No. BBA/DD/437/Carbohydr. Res., 203 (1990) 195-203. * Although all epoxides discussed represent the racemic forms, only the L forms are depicted.

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