Etude par la modélisation moléculaire de la régiosélectivité de l'Ouverture des acides glycidiques par les amines aliphatiques
✍ Scribed by F. Grosjean; M. Huché; M. Larchevêque; J.J. Legendre; Y. Petit
- Publisher
- Elsevier Science
- Year
- 1994
- Tongue
- French
- Weight
- 787 KB
- Volume
- 50
- Category
- Article
- ISSN
- 0040-4020
No coin nor oath required. For personal study only.
✦ Synopsis
A model for glycidic acids opening reaction by ammonia and amines has been suggested from semi-empiric orbital calculations. It provides a way for evaluating the different interactions between the incoming nucleophile and the oxirane substituents. Steric and coulombic interactions of the carboxylate in staggered conformation (cis substitution) has a major influence to rationalize experimental regioselectivity. R&urn& Par des cakuls orbitalaires semi-empiriques, un modble permettant d'kvaluer les diffkntes interactions dans la rEaction d'ouverture des acides glycidiques simples par l'ammoniac et les amines est propos6. La conformation d&al& du ca&oxylate (cas des compods substitu& en cis) induit un encombrement st&ique et une attraction coulombienne qui permet de justifier les rkultats exp&nentaux.
📜 SIMILAR VOLUMES
Proton magnetic resonance spectra of model dipeptide molecules R1-C;O~-N~H~-C;H$R~-C~O~-N~HR-R~ in CC14 solutions exhibit splited signals when investigating on mixtures of L and D enantiomers differing from the racemic composition. The major effect is observed on amide proton signals which are the o