Title
Monoclinic polymorph of 2,5-dide-oxy-2,5-epithio-1,3:4,6-bis-O-[(R)-phenyl-methyl-ene]-l-iditol
Document Type
Article
Publication Date
9-1-2012
Abstract
The title compound C(20)H(20)O(4)S, is polymorphic. In the tetra-gonal form, the mol-ecule lies on a crystallographic twofold axis, while the monoclinic form has only approximate C(2) mol-ecular symmetry. The greatest excursion from C(2) symmetry is in the orientation of the two phenyl rings; at 100 K, one of the rings is rotated -37.2 (3)° and the other by 46.9 (3)° from their symmetric (tetra-gonal) positions. There are only minor differences in the three-ring nucleus; the best mol-ecular fit of the tetra-gonal and monoclinic forms, both at 100 K and excluding phenyl rings and H atoms, shows an r.m.s. deviation of 0.066 Å. Both forms have the same absolute configuration.
Publication Source (Journal or Book title)
Acta crystallographica. Section E, Structure reports online
First Page
o2668
Last Page
9
Recommended Citation
Gibson, J. G., Cho, J. Y., Fronczek, F. R., & Watkins, S. F. (2012). Monoclinic polymorph of 2,5-dide-oxy-2,5-epithio-1,3:4,6-bis-O-[(R)-phenyl-methyl-ene]-l-iditol. Acta crystallographica. Section E, Structure reports online, 68 (Pt 9), o2668-9. https://doi.org/10.1107/S1600536812034514