Please help with these questions on stretching vibration:
5. The antisymmetric -CH2-CO-O- stretching vibration in carboxylic acids is heavily mixed with the in-plane bending mode of the O-H group. In alcohols these two vibrations seldom show evidence of mechanical coupling. Explain.
8. The hydroxylamine I can be oxidized by MnO2 to the amide oxohaemanthidine
(II). In dilute solution the carbonyl absorption band of II occurs at 1702/cm.
Explain this observation.
5. The antisymmetric -CH2-CO-O stretching vibration in carboxylic acids is heavily mixed with the in-plane bending mode of the O-H group due to delocalisation of charge between two oxygens and the C atom of the …
This solution explains why the vibrations in carboxylic acid show little evidence of mechanical coupling and also what observations are seen in the carbonyl absorption. Reaction mechanisms and full explanations are included.