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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

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✦ 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.


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