Acta Cryst. (2012). C68, o502-o506 [ doi:10.1107/S0108270112046689 ]
Abstract: Methyl -D-mannopyranosyl-(14)--D-xylopyranoside, C12H22O10, (I), crystallizes as colorless needles from water, with two crystallographically independent molecules, (IA) and (IB), comprising the asymmetric unit. The internal glycosidic linkage conformation in molecule (IA) is characterized by a ' torsion angle (O5'Man-C1'Man-O1'Man-C4Xyl; Man is mannose and Xyl is xylose) of -88.38 (17)° and a ' torsion angle (C1'Man-O1'Man-C4Xyl-C5Xyl) of -149.22 (15)°, whereas the corresponding torsion angles in molecule (IB) are -89.82 (17) and -159.98 (14)°, respectively. Ring atom numbering conforms to the convention in which C1 denotes the anomeric C atom, and C5 and C6 denote the hydroxymethyl (-CH2OH) C atom in the -Xylp and -Manp residues, respectively. By comparison, the internal glycosidic linkage in the major disorder component of the structurally related disaccharide, methyl -D-galactopyranosyl-(14)--D-xylopyranoside), (II) [Zhang, Oliver & Serriani (2012). Acta Cryst. C68, o7-o11], is characterized by ' = -85.7 (6)° and ' = -141.6 (8)°. Inter-residue hydrogen bonding is observed between atoms O3Xyl and O5'Man in both (IA) and (IB) [O3XylO5'Man internuclear distances = 2.7268 (16) and 2.6920 (17) Å, respectively], analogous to the inter-residue hydrogen bond detected between atoms O3Xyl and O5'Gal in (II). Exocyclic hydroxymethyl group conformation in the -Manp residue of (IA) is gauche-gauche, whereas that in the -Manp residue of (IB) is gauche-trans.
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