CHARACTERISTIC VIBRATIONAL FREQUENCIES OF CYCLIC KETONES

The characteristic CO vibration frequency changes in small ring cyclic ketones are analyzed in terms of the kinetic enery effect of angle variation and the potential energy effects of hybridization and ring strain. A simple model is developed which accounts qualitatively for the effects; a more exact model is used for quantitative correlations. It is found that the changes in CO frequency are due almost entirely to the geometrical effect on the kinetic energy. Hybridization effects cancel out and play little role. © 1968.