title: Crystal structures of O-acetylated 2-acylamino-2-deoxy-D-galactose derivatives.
abstract: The X-ray structures of 1,3,4,6-tetra-O-acetyl-2-deoxy-alpha-D-galactopyranoside derivatives with four different 2-(acylamino) substituents have been determined with Mo K(alpha) radiation at 123 K. The structure of the 2-acetylamino derivative and of its acyl-homologs with a 2-(propanoylamino)-, 2-(butanoylamino)-, and 2-(2-methyl-propanoylamino)-group crystallized in the monoclinic space group C2. The pyranose unit of all compounds has the usual 4C(1) shape. The different orientations of the 6-O-acetyl-groups are discussed. Conformations of the acylamino-group are compared to those found in the crystal structure of N-acetyl-alpha-D-galactosamine.
mesh_terms: D000116:Acetylgalactosamine / Q000031:analogs & derivatives*; D002236:Carbohydrate Conformation; D002240:Carbohydrate Sequence; D003460:Crystallization; D018360:Crystallography, X-Ray / Q000379:methods*; D005690:Galactose / Q000031:analogs & derivatives* / Q000737:chemistry; D006860:Hydrogen Bonding; D008958:Models, Molecular; D015394:Molecular Structure
chemical_list: C019327:2-deoxy-lyxo-hexose; D000116:Acetylgalactosamine; D005690:Galactose