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- W2062527654 abstract "En étudiant par RMN cinq anilides de formule générale en milieu acide, les auteurs ont mis en évidence la protonation de l'atome d'azote de l'ion amidonium formé. Five substituted anilides of general formula were studied in acidic media (H2SO4MeOH and HSO3ClMe2CO). The unsolved problem of the protonation site (O-protonation and N-protonation) is discussed in terms of the observed NMR shifts [(δNH) and δ(COH)] taking into account several factors including hydrogen bonding and solvent effects. New dramatic evidence is presented of N-protonation of the amide group; in the case of 2,4-dinitro formanilide, the NO2 groups in the molecule enhance the relative basicity of the nitrogen atom in such a way that the amount of N-protonated amide can be detected. N-protonation is a function of the acidity, showing a maximum in the region of 40 to 50%." @default.
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- W2062527654 date "1970-04-01" @default.
- W2062527654 modified "2023-09-27" @default.
- W2062527654 title "Etude de la Protonation du Groupe Amide par Resonance Magnetique Nucleaire. Comportement des Anilides Substitues en Milieu Acide Concentre" @default.
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- W2062527654 doi "https://doi.org/10.1002/mrc.1270020211" @default.
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