Glucopyranose crystal structure

Fig. 1. —The Crystal Structure of a-D-Glucopyranose, Viewed Along the [001] Axis. (There are two hydrogen bonds at each 0-4, but one has been omitted for clarity. Diagram kindly provided by Dr. George M. Brown, Oak Ridge National Laboratory, Oak Ridge, Tennessee.)...

The crystal structure of cellobiose [0-/3-D-glucopyranosyl-(l— 4)-/3-D-glucopyranose] (12) has been determined for the third time.10 The... 

The hydrogen bonding in cellobiose and methyl cellobioside as models for that in the celluloses. In the absence of crystal structure analyses of higher oligomers of 1 - 4-linked /5-glucopyranose, cellobiose is frequently used as a model for interpreting the X-ray fiber diffraction patterns of the celluloses, especially since the cellobiose unit is considered to be the repeating unit of the polysaccharide chain. 

The similar distinct absorption peak shown for yff-D-fructopyranose is associated with a weakly bonding 0(4)H group forming a two-center H 0 bond of 2.07 A (Fig. 13.25). A similar separate absorption peak should also be observed for the very weakly bonded 0(4)H group in the / -D-glucopyranose (Fig. 13.27) and /1-lactose (Fig. 13.43) crystal structures, but hitherto these have not been reported. 

The hydrogen bonding in melibiose monohydrate includes a homodromic cycle. Cyclic hydrogen-bonding schemes are not common in mono- and disaccharides, but in the crystal structure of the epimeric a,yS-melibiose monohydrate, 6-0-a-D-galactopyranosyl-cr,/ -D-glucopyranose-H20 [MELIBM01] (Fig. 13.49),... 

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