反应详情

A mixture of 2-bromo-5-chloro-toluene (2.00 g, 9.75 mmol), NBS (2.08 g, 11.7 mmol) and catalytic amount of AIBN in carbon tetrachloride (50 ml) was stirred under refluxing conditions for 4 h. TLC (EtOAc:hexane=5:95) showed no starting material. The mixture was filtered and the filtrate was concentrated. The title compound was obtained as a white solid after flash column using EtOAc:hexane=5:95 as the elute. 1H NMR (CDCl3, 500 MHz) δ 7.53 (d, J=9.0 Hz, 1H), 7.47 (d, J=2.5 Hz, 1H), 7.18 (dd, J=8.5, 2.5 Hz, 1H), 4.60 (s, 2H).

1. filtrationThe mixture was filtered
2. concentrationthe filtrate was concentrated