反应详情

0.39 g (1 mmol) of 5-chloro-2,2,6,6-tetramethyl-4-(2-methyl-6-trifluoromethylpyridine-3-carbonyl)cyclohex-4-ene-1,3-dione and 0.20 g (1.1 mmol) of N-bromsuccinimide are refluxed in the presence of a catalytic amount of dibenzoyl peroxide in 10 ml of carbon tetrachloride. After the reaction has subsided, the resulting succinimide is removed by filtration and the crude product is purified by column chromatography (mobile phase: ethyl acetate/hexane 1:4). This gives pure 4-(2-bromomethyl-6-trifluoromethylpyridine-3-carbonyl)-5-chloro-2,2,6,6-tetramethylcyclohex-4-ene-1,3-dione of melting point 94.5-95° C.

1. customthe resulting succinimide is removed by filtration
2. customthe crude product is purified by column chromatography (mobile phase: ethyl acetate/hexane 1:4)