Krueger, Peter J. published the artcileAmino group stretching vibrations in primary acid amides, Computed Properties of 16332-06-2, the publication is Canadian Journal of Chemistry (1967), 45(14), 1611-18, database is CAplus.
Most primary alkyl, primary α-substituted alkyl, and primary aromatic acid amides exhibit three sharp concentration and temperature dependent absorption bands at 3518 ± 3, 3504 ± 4, and 3486 ± 8 cm.-1, in dilute (0.003M or less) CCl4 solution, just below the fundamental antisymmetric NH2 stretching vibration. These are tentatively assigned to the shifted antisymmetric NH2 stretching vibration in cyclic dimers, cyclic trimers, and cyclic tetramers resp., with increasing NH…O hydrogen bond strength. In all alkyl amides the antisymmetric NH2 band intensity exceeds the symmetric band intensity. Conjugation of the CONH2 group with π-electron systems reverses this intensity relation, except where the acidic NH2 group can form intramol. H bonds. These observations substantiate the previously published views on the nature of the vibrational mechanism of the NH2 group. No evidence is found for enolization of amides in CCl4 solution 31 references.
Canadian Journal of Chemistry published new progress about 16332-06-2. 16332-06-2 belongs to ethers-buliding-blocks, auxiliary class Amine,Aliphatic hydrocarbon chain,Amide,Ether, name is 2-Methoxyacetamide, and the molecular formula is C3H7NO2, Computed Properties of 16332-06-2.
Referemce:
https://en.wikipedia.org/wiki/Ether,
Ether | (C2H5)2O – PubChem