AI I1 as the over-all resu1. t of the action of mineral acids on I. An interpretation of the course of this rearrangement, which provides a route to derivatives of 1, 5H-pyrindine and bears on the more general question of acid catalysis in the condensation of ketones with carboxylic acids, is also presented. Some correlations between structure and ultraviolet absorption spectra among a-pyridones are discussed.
