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condensing phthalyl chloride with benzene in the presence of aluminium chloride, obtained diphenylphthalide (phthalophenone) as the main product and some anthraquinone and o-benzoylbenzoic acid as by-products. Haller and Guyot (Bull. Soe. chim., 1897, [iii], 17, 873), on repeating the condensation, succeeded in isolating a small quantity of diphenylanthrone. Scheiber (Annalen, 1912, 389, 121) , however, found the main product of the reaction, when carried out a t a low temperature, t o bedoi:10.1039/ct9171100010 fatcat:blmlzh46g5bkrpcqale4dh7kgi