Mechanism of the formation of semiquinone radicals by ultra-violet irradiation of six-membered aromatic aza-compounds in neutral methanol, and of radical cations by ultra-violet irradiation of six-membered aromatic diaza-compounds in methanol acidified with hydrochloric acid

Abstract

9-Phenylacridine and quinoxaline react with methanol but do not directly abstract a hydrogen radical from the solvent; in methanol–HCl, pyrazine, quinoxaline, and phenazine give radical cations.