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6-De-oxy-3,4-O-isopropyl-idene-2-C-methyl-l-galactono-1,5-lactone.

ABSTRACT: X-ray crystallography unequivocally confirmed the stereochemistry of the 2-C-methyl group in the title mol-ecule, C(10)H(16)O(5), in which the 1,5-lactone ring exists in a boat conformation. The absolute stereochemistry was determined by the use of d-ribose in the synthesis. The crystal exists as O-H?O hydrogen bonded chains of mol-ecules running parallel to the a axis with each mol-ecule acting as a donor and acceptor for one hydrogen bond.

SUBMITTER: Jenkinson SF

PROVIDER: S-EPMC3200809 | biostudies-other | 2011 Sep

REPOSITORIES: biostudies-other

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6-De-oxy-3,4-O-isopropyl-idene-2-C-methyl-l-galactono-1,5-lactone.

Jenkinson Sarah F SF Parry Loren L LL Wilson Francis X FX Fleet George W J GW Watkin David J DJ

Acta crystallographica. Section E, Structure reports online 20110831 Pt 9

X-ray crystallography unequivocally confirmed the stereochemistry of the 2-C-methyl group in the title mol-ecule, C(10)H(16)O(5), in which the 1,5-lactone ring exists in a boat conformation. The absolute stereochemistry was determined by the use of d-ribose in the synthesis. The crystal exists as O-H⋯O hydrogen bonded chains of mol-ecules running parallel to the a axis with each mol-ecule acting as a donor and acceptor for one hydrogen bond. ...[more]

PMID: 22059064

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2-Azido-2-de-oxy-3,4-O-isopropyl-idene-2-C-methyl-d-talono-1,5-lactone.

Project description:The relative stereochemistry of the title compound, C(10)H(15)N(3)O(5), was confirmed by the crystal structure determin-ation. The absolute configuration was determined from the use of d-lyxonolactone as the starting material. The six-membered ring adopts a boat conformation with the larger azide group, rather than the methyl group, in the bowsprit position. In the crystal structure, a bifurcated inter-molecular O-H?O/O-H?N hydrogen bond links mol-ecules into chains running parallel to the b axis.

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Project description:X-ray crystallography unequivocally confirmed the stereochemistry of the 2-C-methyl group in the title mol-ecule, C(10)H(16)O(6), in which the 1,5-lactone ring exists in a boat conformation. The use of d-galactose in the synthesis determined the absolute stereochemistry. The crystal exists as O-H?O hydrogen-bonded layers in the ab plane, with each mol-ecule acting as a donor and acceptor for two hydrogen bonds.

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Project description:X-ray crystallography firmly established the relative stereochemistry of the title compound, C(17)H(22)N(2)O(3). The absolute configuration was determined by use of 2-C-methyl-d-ribonolactone as the starting material. The compound exists as O-H?N hydrogen-bonded chains of mol-ecules running parallel to the a-axis.

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Project description:In the title compound, C(10)H(18)O(5)·H(2)O, the fucopyran-oside ring adopts a chair conformation. The crystal packing is stabilized by inter-molecular O-H?O and C-H?O hydrogen bonds together with intra-molecular O?O [2.2936?(8)?Å] and inter-molecular O?O [2.7140?(8)-2.829?(3)?Å] short contacts. The mol-ecules are linked together to form an infinite chain along the a axis. This structure has been solved previously but with no R-values [Spiers (1931). Z. Kristallogr. Kristallgeom. Kristallphys. Kristallchem.78, 101].

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