Recherches par resonance magnetique nucleaire sur les rotations empechees—IV: Determination des parametres d'activation associes a l'interconversion des isomeres de rotation autour de la liaison ?C?C? dans la serie des composes carbonyles vinyliques β-amines |
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| Authors: | Marie-Louise Filleux-Blanchard Henri Durand Grard Jean Martin |
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| Institution: | Marie-Louise Filleux-Blanchard,Henri Durand,Gérard Jean Martin |
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| Abstract: | Restricted rotation around the C? C bond in the O?C? C?C? N system is responsible of the s-cis and s-trans conformers as shown by the NMR spectra of vinylogous amides (CH3)2N? CH?CH? CO? R. Substituent effect (nature of R) is discussed in terms of conformational equilibrium. Theoretical line shapes have been computed and fit reasonably well with the experimental spectra; activation functions were also derived. |
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