Journal of the Chemical Society C: Organic Pub Date : , DOI:10.1039/J3966000087A
Abstract
9-Acridone and 3,6-dichloro-9-acridone have been prepared in high yields by treatment of the corresponding 2,2′-diaminobenzophenones with 100% phosphoric acid. Boiling hydrochloric acid does not effect these cyclisations.
