反应详情

A solution of 1-bromo-2-difluoromethylbenzene (9.6 g, 46.8 mmol) and N-bromosuccinimide (24.8 g, 139 mmol) in carbon tetrachloride (100 mL) was irradiated with a sunlamp. After 3 days, the reaction mixture was diluted with hexane, the precipitate was filtered off, and the collected organic filtrate was concentrated in vacuo. Purification by flash chromatography on silica gel (100% hexanes) provided the title compound: 1H NMR (500 M=Hz, CD2Cl2) δ7.74 (d, J=8.0 Hz, 1H), 7.66 (dd, J=8.0, 1.5 Hz, 1H), 7.44 (t, J=7.7 Hz, 1H), 7.37 (td, J=7.7, 1.3 Hz, 1H).

1. filtrationthe precipitate was filtered off
2. concentrationthe collected organic filtrate was concentrated in vacuo
3. customPurification by flash chromatography on silica gel (100% hexanes)