Acyclic anhydrides exhibit a reversal of the intensity relationship of the carbonyl stretching vibrations found in the cyclic anhydrides. That is, the lower wavenumber band is now the weaker member of...

Acyclic anhydrides exhibit a reversal of the intensity relationship of the carbonyl stretching vibrations found in the

cyclic anhydrides. That is, the lower wavenumber band is now the weaker member of the pair. Explain why this

intensity exchange occurs.