Heterocyclic quinones
Oxidation of substituted 4-amino-6-hydroxyquinaldines and 4-chloro-6-hydroxiquinaldine with oxygen in the presence of Cu++-secondary amine complexes has yielded a new group of compounds, substituted 4-aminoquinoline-5,6-quinones. The reaction intermediate, 4-chloroquinaldine-5,6-quinone, has been prepared and oxidized. The effects of substituents on the course of the oxidation have been examined, and some properties of the compounds obtained have been investigated.