Summary Detailed analysis of the exchange-broadened'H NMR spectra of 2, 4, 6-t. rihydroxy derivatives of benzaldehyde and acetophenone yield activation enthalpies of 8.0 and 6.9 kcal/mol, respectively, for the exchange of the o-hydroxyl environments. Slightly lower barriers are surmised for the corresponding 2, 6-dihydroxy compounds. Theoretical calculations using approximate molecular orbital theory indicate that the exchange ...
