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At reflux, 696.2 g (2.97 mol) of aqueous 50% strength N-methylmorpholine N-oxide solution were added to a solution of 312.0 g (0.99 mol) of methyl 3-bromomethyl-2,4-dichlorobenzoate in 2 l of acetonitrile. After stirring for 48 hours at room temperature, the reaction solution was stirred into 6 l of water. The precipitate was filtered off with suction, washed with water and dried under reduced pressure. 141.3 g of methyl 2,4-dichloro-3-formylbenzoate were obtained.

1. temperatureAt reflux
2. filtrationThe precipitate was filtered off with suction
3. washwashed with water
4. customdried under reduced pressure