Abstract:The 13C n.m.r. spectrum of acetoxime has been obtained in five representative solvents and the chemical shifts of the three carbon atoms measured. The solvent effects on the chemical shifts are found to reflect specific solute-solvent interactions. The effect of deuteration of the u-protons on the chemical shift of the oximino carbon is also discussed.Le spectre r.m.n. de "C de I'acetoxime a ete obtenu dans cinq solvants judicieux, et les deplacements chimiques des trois atomes de carbone ont tte mesures. Les … Show more
0-Dialkylaminoathoximine 1 sind aus 0-Dialkylaminoathoxy-aminen 2 zu gewinnen, die ihrerseits aus substituierten Acetonoximen 3 synthetisiert werden. Diese zeigen im ' H-NMR-Spektrum eine Aufspaltung der Methylgruppen, die bei Temperaturerhohung verschwindet. Es werden die Koaleszenztemperaturen bestimmt und die Aktivierungsenthalpien nach Eyring berechnet.
Dialkylaminoethoximino-propanes
0-Dialkylaminoethoximines I may & obtained fromsynthesized from substituted acetone oximes 3. The HNMR-spectra of 3 show different chemical shifts of the methyl groups These coalesce at higher temperatures. The temperatures of coalescence are measured, and the enthalpies of activation are calculated according to Eyring.
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