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Preparation from 2-nitrothioxanthen-9-one 10,10-dioxide (SM) by a three-step synthesis: SM by refluxing in a solution of 2% sodium hydroxide in dioxane/water mixture (65:35) for 2 h, gave the 2-(2-hydroxy-5-nitrobenzoyl)phenylsulfinic acid (89%). The former by reaction with mercuric chloride in refluxing aqueous acetic acid for 4 h led to the 2-chloromercuri-2r-hydroxy-5'-nitrobenzophenone (82%). Removal of the chloromercury group was achieved with concentrated hydrochloric acid in refluxing ethanol for 2 h (84%) [160].

P. and Spectra (NA). wt. 11 Synthesis -Preparation by demethylation of 2,3-dichloro-4-methoxybenzophenone (SM), *with aluminium chloride, in refluxing methylene chloride overnight [653] or in refluxing benzene for 5 h [1270]; *with pyridinium chloride at 180° for 2 h (99%) [618]. t. p. 123-126° [653]; Spectra (NA). wt. 11 Synthesis -Preparation by Fries rearrangement of 3,5-dichlorophenyl benzoate with aluminium chloride for 30 min at 150-160° [375]. p. 156-157° [375]; Spectra (NA). wt. 11 Synthesis -Preparation by Friedel-Crafts acylation of 2,5-dichlorophenol with benzoyl chloride in the presence of aluminium chloride in refluxing ethylene dichloride for 33 h (61%) [1195].

Also obtained by Fries rearrangement of m-bromophenyl benzoate with aluminium chloride [692], at 200° for 20 min [766]. t. for 12 h [766], according to [891]. p. 83° [995,998], 79° [1052]; IR [68, 998, 1052], UV [72]. wt. 11 Syntheses -Preparation by Fries rearrangement of p-bromophenyl benzoate with aluminium chloride without solvent at 150° for 15 min (42%) [183]. -Preparation by oxidation of 5-bromo-2,3-diphenylbenzofuran with chromium trioxide in boiling acetic acid, followed by saponification of the obtained keto ester — 2-(benzoyloxy)-5-bromobenzophenone — with sodium hydroxide [1052] with potassium hydroxide in refluxing ethanol (65%) [575].

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