Benzoyl Peroxide → 1-(Bromomethyl)-4-fluoro-2-nitrobenzene

反応式

[N+:1]([C:4]1[CH:9]=[C:8]([F:10])[CH:7]=[CH:6][C:5]=1[CH3:11])([O-:3])=[O:2].[Br:12]N1C(=O)CCC1=O.C(OOC(=O)C1C=CC=CC=1)(=O)C1C=CC=CC=1>C(Cl)(Cl)(Cl)Cl>[N+:1]([C:4]1[CH:9]=[C:8]([F:10])[CH:7]=[CH:6][C:5]=1[CH2:11][Br:12])([O-:3])=[O:2]

参加物

実験手順

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.