## Abstract In connection with studies of the solid state photolysis the crystal and molecular structure of 3βdehydro gibberellin A~3~ was determined by Xβray analysis. The final discrepancy factor __R__ was 0.078. The packing of the molecules in the crystal explains the preference of intramolecula
A quantitative application of the J-based configuration analysis method to a flexible small molecule
β Scribed by Gary J. Sharman
- Publisher
- John Wiley and Sons
- Year
- 2007
- Tongue
- English
- Weight
- 199 KB
- Volume
- 45
- Category
- Article
- ISSN
- 0749-1581
- DOI
- 10.1002/mrc.1971
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β¦ Synopsis
Abstract
An example of the use of the Jβbased configuration analysis method to determine relative stereochemistry of a small molecule related to reboxetine is described. This study was complicated by the fact that the molecule did not exhibit Jβcouplings and NOEs consistent with a single conformation, but rather an ensemble average. A quantitative fitting procedure using predicted couplings and NOEs from all possible conformers was used. This gave a clear indication of the stereochemistry, and the populations of the conformers involved. Copyright Β© 2007 John Wiley & Sons, Ltd.
π SIMILAR VOLUMES
The computer program PRODIS is used to find low energy conformations of flexible molecules by searching the potential energy surface(s) of one or more torsion angles via rigid rotation. The n-dimensional grid of energy versus torsion angles is then converted to a Boltzman probability distribution, w
The Electrostatically Driven Monte Carlo (EDMC)method was applied in a study of a decamer of glycine whose conformational behavior is described by the Empirical Conformational Energy Program for Peptides (ECEPPIB) potential energy model. When free neutral end groups were used, it was found that conf