By Wallin H.
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Extra info for A convergence problem on rational approximation in several variables
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%) .
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  or in refluxing benzene for 5 h ; *with pyridinium chloride at 180° for 2 h (99%) . t. p. 123-126° ; Spectra (NA). wt. 11 Synthesis -Preparation by Fries rearrangement of 3,5-dichlorophenyl benzoate with aluminium chloride for 30 min at 150-160° . p. 156-157° ; 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%) .
Also obtained by Fries rearrangement of m-bromophenyl benzoate with aluminium chloride , at 200° for 20 min . t. for 12 h , according to . p. 83° [995,998], 79° ; IR [68, 998, 1052], UV . wt. 11 Syntheses -Preparation by Fries rearrangement of p-bromophenyl benzoate with aluminium chloride without solvent at 150° for 15 min (42%) . -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  with potassium hydroxide in refluxing ethanol (65%) .