Sodium hydride → Methyl (4-chlorophenyl)(4,5-dichloro-2-nitrophenyl)acetate

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A solution of 5 g of 1,2-dichloro-4-fluoro-5-nitrobenzene and 4.4 g of methyl 4-chlorophenylacetate in 70 ml of DMF is added, under a stream of nitrogen, to a suspension at −10° C. of 2.85 g of 60% NaH in 45 ml of DMF, and the temperature is maintained at −5° C. The mixture is reacted for 2 hours, while allowing the temperature to return to room temperature. The resulting mixture is poured onto ice, aqueous 10% NH4Cl solution is added and the mixture is extracted with ethyl acetate. The organic phase is dried, filtered and concentrated. 30 g of a brown oil are obtained, and are purified on a column with hexane and then with a 95/5 hexane/EtOAc mixture to give 3.18 g of oil.

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