Methanol → Methyl 3-(trifluoromethyl)benzoate

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To a solution of 3-(trifluoromethyl)benzoic acid (5 g, 26.30 mmol, 1.00 equiv) in methanol (25 mL) was added dropwise thionyl chloride (9.39 g, 78.93 mmol, 3.00 equiv) and the resulting solution was stirred for 2 h at 75° C. in an oil bath. The mixture was concentrated under vacuum, diluted with 100 mL of ethyl acetate and then washed with 2×30 mL of sodium carbonate and 2×30 mL of brine. The organic layer was dried over anhydrous sodium sulfate and concentrated under vacuum to yield 4.6 g (86%) of methyl 3-(trifluoromethyl)benzoate as yellow oil

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