Structural studies of O-sulfated D-glucosamines. The crystal and molecular structures of 2-amino-2-deoxy-α/ β-D-glucopyranose 3-sulfate (free acid) and 2-amino-2-deoxy-β-D-glucopyranose 6-sulfate (free base)

The crystal and molecular structures of 2-amino-2-deoxy-α/ β-D-glucopyranose 3-sulfate (1) and 2-amino-2-deoxy-β-D-glucopyranose 6-sulfate (2) have been determined by direct methods. The sugar rings have the expected 4C1 conformation and the geometries of the sulfate groups are comparable with those found in previous investigations except for a significant shortening of the CO bond and closing of the COS bond angle in 2.