BrCS[C:4]1[CH:5]=[CH:6][CH:7]=[CH:8][CH:9]=1.[Cl-].[Al+3].[Cl-].[Cl-].[C:14](Cl)(=[O:21])[C:15]1[CH:20]=[CH:19][CH:18]=[CH:17][CH:16]=1>ClCCl>[C:14]([C:15]1[CH:20]=[CH:19][CH:18]=[CH:17][CH:16]=1)(=[O:21])[C:4]1[CH:5]=[CH:6][CH:7]=[CH:8][CH:9]=151.3 g (300 mmol) of m-bromomethylthiobenzene was added dropwise to a dichloromethane (350 ml) solution containing 47.9 g (359.6 mmol) of aluminum chloride and 42.4 g (300 mmol) of benzoyl chloride which was cooled to 0° C. After addition, the resulting mixture was stirred for 2 hours. After a reaction, the reaction solution was washed with water, the solvent was removed, and the obtained product was purified by column chromatography to obtain a benzophenone derivative represented by the following formula (35) as 58.1 g (189 mmol, yield of 63%) of a yellow solid.
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