反应详情

A mixture of 2-nitro-4-fluorotoluene (1.65 g), N-bromo-succinimide (1.78 g), carbon tetrachloride 10.0 ml) and benzoyl peroxide (0.1 g) was heated at the reflux temperature until the solid residue was observed to be floating at the surface (ca. 3 hours). After removing the solid by filtration, the filtrate was diluted with diethyl ether, washed with water, dried over anhydrous magnesium sulphate and concentrated by evaporation of the solvents under reduced pressure. The residue (estimated to contain ca. 35% w/w of the benzyl bromide in admixture with unchanged starting material) was subjected to column chromatography using a silica column and diethyl ether/petroleum ether (ratio 1:9 v/v) as eluent to yield pure 2-nitro-4-fluorobenzyl bromide.

1. temperaturewas heated at the reflux temperature until the solid residue
2. customto be floating at the surface (ca. 3 hours)
3. customAfter removing the solid
4. filtrationby filtration
5. additionthe filtrate was diluted with diethyl ether
6. washwashed with water
7. dry with materialdried over anhydrous magnesium sulphate
8. concentrationconcentrated by evaporation of the solvents under reduced pressure