Chemistry of indanthrone. Part X. 7,16-Dihydrodinaphtho[2,3-b:2′,3′-i]phenazine-5,9,14,18-diquinone: a linear isomer of indanthrone

Abstract

The title compound has been prepared by the self-condensation of 2-amino-3-bromo- or -chloro-anthraquinone under anhydrous conditions, and also by the condensation of 2,3-diaminoanthraquinone with either 2,3-dibromoanthraquinone or 2,3,9,10-anthradiquinone. The physical properties of the linear isomer are compared with those of indanthrone, and the effect of inter- and intra-molecular hydrogen-bonding in such compounds is discussed. The physical and chemical properties of several 2,3-disubstituted derivatives of anthraquinone are recorded.