The crystal structure of methyl 3,4-O-isopropylidene-β-L-erythro-pentopyranosid-2-ulose
✍ Scribed by Palmer, H. T. ;Palmer, R. A.
- Book ID
- 114523247
- Publisher
- International Union of Crystallography
- Year
- 1976
- Weight
- 424 KB
- Volume
- 32
- Category
- Article
- ISSN
- 0567-7408
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📜 SIMILAR VOLUMES
Vicinal proton-proton spin-coupling constants for methyl 5-O-acetyl-2-O-benzoyl-3,4-O-isopropylidene-fl-L-idoseptanoside (1) have led to the assignment [1] of the twist-chair conformation, °'ITC2, 3 [2], for the seven-membered ring in 1 in which the pseudo-axis of symmetry passes through C-5. Since
The molecule is a derivative of the naturally occurring carbohydrate D-fNCtOSe. The data reported here indicate that the ketose six-membered ring is constrained by the presence of two fused five-membered rings into the 3So conformation. These findings agree with the n.m.r.-spectroscopic results for