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.
R. T. Parfitt, J. Chem. Soc. C, 1966, 87a DOI: 10.1039/J3966000087A
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