Add time:09/24/2019         Source:sciencedirect.com

In the present work we investigated the conformations of some N-mono-substituted propanamides of general formula CH3CH2CONHR, wherein R is chosen from n-(C1C9)alkyl, cyclo(C3C6)alkyl, some branched (C3C6)alkyl or phenyl. The amides were synthesised by the well known Schotten-Baumann reaction—acylation of the corresponding amines with propionyl chloride. On the basis of FTIR data for diluted solutions (concentrations below 10−3 mol dm−3) of N-mono-substituted propanamides in carbon tetrachloride, chloroform, dichloromethane, or a 1:1.5 mixture of benzene and carbon tetrachloride the exact position of the N-H stretching band was established. For spectroscopic data the different conformational isomers were assigned and its structures unequivocally proven. These results are in good accordance with 1H NMR and MS data.

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