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Purification of Laboratory Chemicals, 8th Edition by W.L.F. Armarego

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Benz[a]anthracene-7,12-dione [2498-66-0] C18H10O2, M 258.3, m 169.5-170.5°, 169-171°. Crystallise the dione from MeOH (charcoal), toluene, toluene/hexane, Me2CO, or AcOH. Alternatively, purify it by sublimation in vacuo, or by zone refining. [Beilstein 7 H 826, 7 I 440, 7 II 760, 7 III 4278, 7 IV 2644.]

Benzanthrone [82-05-3] C17H10O, M 230.3, m 168-170°, 170°, 170-173°, pK25 -3.2 (aqueous H2SO4). Crystallise benzanthrone from EtOH or xylene. The solubility (w/w at ~20°) in *PhCl is 2.05%, in *C6H6 is 1.61% and in AcOH it is 0.52%. On a larger scale benzanthrone (~58g) is dissolved in tetrachloroethane (175ml, b 147°/atm), charcoal (12g) is added and boiled under reflux for 15min, filtered, the carbon is washed with hot solvent (50ml), the combined ...

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