Les oxazolines-4 précurseurs de sels d'iminium fonctionnels. Ouverture en milieu anhydre de ces hétérocycles par des acides protoniques: obtention de sels d'iminium fonctionnels, étude de leur structure
The protonation of 4-oxazolines with protic acids in anhydrous medium, both at low or at room temperature, generally leads to acyclic functional iminium salts. In those cases where the oxazoline ring bears a hydrogen atom in the four position, two diastereoisomeric cyclic iminium salts are obtained. The conditions for preparation of these salts along with the characterization of their structures were determined by the aid of 1H and 13C nmr.
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