Hydrochloric Acid → 2-Chloro-1-(2,4-difluoro-5-methylphenyl)ethan-1-one

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To a stirring solution of 2,4-difluorotoluene was added 6.3 g (47.3 mmol) of AlCl3, and 3.4 mL (42.6 mmol) of chloroacetyl chloride at 0° C. After the mixture was stirred for 10 min. at 0° C. and then at 45° C. for 30 min. The mixture was allowed to cool to r.t., about 16 mL of conc. HCl, 25 mL of water, and 100 mL of EtOAc were added. The organic layer was separated and washed with brine and sat. NaHCO3 (2×), and dried over Na2SO4. The solution was filtered and concentrated to give 9.0 g of 2-chloro-1-(2,4-difluoro-5-methylphenyl)ethanone as a colorless solid that was used without further purification.

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