## Abstract The geometries and relative energies of new __N__,__N__ carbonyl dipyrrinone‐derived oxime molecules (__E__/__Z__‐__s__‐__cis__ 4a and __E__/__Z__‐__s__‐__cis__ 4b) have been investigated. The calculated energies, molecular geometries, and ^1^H/^13^C NMR chemical shifts agree with exper
NMR analysis of the configuration and conformation of N-acetylneuraminosyl-(2 → 3)-lactose
✍ Scribed by J. Schulte; J. Lauterwein; U. Höweler
- Publisher
- John Wiley and Sons
- Year
- 2000
- Tongue
- English
- Weight
- 141 KB
- Volume
- 38
- Category
- Article
- ISSN
- 0749-1581
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The configuration and conformation of silyl ketene thioacetals derived from 2-pyridyl thioesters were studied by combined NMR and computational analysis. The results revealed that the (E)-silyl ketene thioacetal is always the thermodynamically favoured diastereoisomer; the equilibrium ratio is rever
## Abstract The absence of HH couplings between the methoxy group and the ring protons observed in 2‐methoxy‐, 2,6‐dimethoxy‐ and 2‐methoxy‐6‐chloropyridines is interpreted in terms of a __cis__ conformation between the methyl fragment and the nitrogen ring atom. Other data, taken from the current
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