反应详情

2.3 g (0.0152 mol) of 3-(3,5-dichlorophenyl)-1H-pyrazole are dissolved, at room temperature and with stirring, in 300 ml of dichloromethane. 2.07 g (0.016 mol) of N-chlorosuccinimide are then added and then stirring is continued for 4 days at room temperature. The reaction mixture is then concentrated and then chromatographed on a silica column (eluent 70/30 heptane/ethyl acetate). 1.4 g (yield: 57%, melting point: 192° C.) of 4-chloro-3-(3,5-dichlorophenyl)-1H-pyrazole are obtained.

1. concentrationThe reaction mixture is then concentrated
2. customchromatographed on a silica column (eluent 70/30 heptane/ethyl acetate)