Benzoyl Peroxide → 1,3-Dibromo-2-(bromomethyl)-5-methoxybenzene

Reaktionsgleichung

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

Komponenten

Versuchsvorschrift

To a suspension of 5.0 g of 2,6-dibromo-4-methoxytoluene in 90 mL of CCl4 was added N-bromosuccinimide and benzoyl peroxide. The resulting mixture was heated to reflux and stirred at the refluxing temperature while irradiating with a sunlamp for 2 h, then cooled and concentrated. The resulting residue was dissolved in 1:1 hexanes-Et2O and filtered through a pad of silica gel, then purified by flash chromatography on a Biotage 40M column, eluting with 98:2 hexanes-Et2O, to yield 2,6-Dibromo-4-methoxy-benzyl bromide as a pale yellow solid. 1H NMR (500 MHz, CDCl3): δ 7.11 (s, 2H); 4.82 (s, 2H); 3.80 (s, 3H).