N-bromobutanimide → Methyl 3-bromomethyl-2-chloro-4-methylsulfonylbenzoate

Participants

Reaction Steps

82 g (0.31 mol) of methyl 2-chloro-3-methyl-4-methylsulfonylbenzoate were dissolved in 2 l of carbon tetrachloride and, with exposure to light, admixed a little at a time with 56 g (0.31 mol) of N-bromosuccinimide. The reaction mixture was filtered, the filtrate was concentrated and the residue was taken up in 200 ml of methyl tert-butyl ether. The solution was admixed with petroleum ether and the precipitated solid was filtered off with suction and dried. 74.5 g (70% of theory) of methyl 3-bromomethyl-2-chloro-4-methylsulfonylbenzoate were obtained.

Provenance & Evidence