The crystal structure of 1,6-anhydro-3,4-O-isopropylidene-β-D-talopyranose

N. C. Panagiotopoulos
1974 Acta Crystallographica Section B  
The crystal structure of 1,6-anhydro-3,4-O-isopropylidene-fl-D-talopyranose, C9H,4Os, [P212121, a= 20-191 (5), b= 8.220 (2), c= 5.717 (2) ,~, Z=4], has been determined from 1017 X-ray reflections measured with Cu Ka radiation on an automatic diffractometer and refined to an R= 0.045. The anhydro and isopropylidene rings are on the same side of the py'ranose ring, so that the molecule has an overall 'tub' conformation. The pyranose ring is a distorted 3C0 chair. Small differences are observed in
more » ... ces are observed in the C-O bond lengths of the anhydride ring, similar to those observed in other anhydro sugars. The molecules are packed by van der Waals interactions with one weak intermolecular hydrogen bond with a H..-O distance of 2.3 A.
doi:10.1107/s0567740874004973 fatcat:vv62zjkeonacbhvqdnfi4svd5y