fl-D-Glucose (C6HlzO6) consists of a pyranose ring with substituents which are all equatorial. It crystallizes in the orthorhombic system with a = 9.29 ___ 0.04, b = 12-65 _ 0.02, c = 6.70 ___ 0.02 A. The space group is P212121 with 4 molecules in the cell. The crystal structure has been solved by a combination of a direct method and trial and error applied to two-dimensional data. The final refinement was obtained by an anisotropic least-squares analysis of approximately 850 observed three-dimensional structure factors. The three positional and six thermal parameters of all atoms except hydrogens have been determined.The pyranose ring is in the Sachse trans configuration and the ring oxygen bond angle is determined as 113 °. The detailed stereochemistry is compared with that of a-D-glucose and cellobiose.

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