Conformational preferences in alkyl-as well as Ph-substituted 3-piperideines (1,2,3,6-tetrahydropyridines) have been characterized by ab initio and molecular mechanics calculations. A set of rules and subrules for estimation of the conformational equilibrium (in terms of preferred substituent orient
Ab initio and molecular mechanics conformational analysis of neutral L-proline
✍ Scribed by Michael Ramek; Anne-Marie Kelterer; Sonja Nikolić
- Publisher
- John Wiley and Sons
- Year
- 1997
- Tongue
- English
- Weight
- 243 KB
- Volume
- 65
- Category
- Article
- ISSN
- 0020-7608
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✦ Synopsis
The energetically low-lying parts of the potential energy surface of Ž . L -proline were investigated by ab initio RHFr6-311qqG)) calculations. The results are discussed with respect to the parametrization of the MM3 force field and in comparison with those obtained earlier for glycine and ␣-alanine, on the one hand, and for N-acetyl-L-proline amide, on the other hand.
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A new molecular mechanics MM3 force field has been developed based on various experimental data as well as ab initio calculations. Computergenerated molecular structures and energy values were compared with experimentally determined data. The acyl halides studied were formyl halides, acetyl halides,
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