Pyridine → HCID 178478288, compound

Participants

Reaction Steps

4 g (0.0132 mol) of 3-(3,5-dibromophenyl)pyrazole and 1 g of pyridine (0.0132 mol) are dissolved, at room temperature and with stirring, in 50 ml of 1,2-dichloroethane. 2 g (0.0145 mol) of sulphuryl chloride in 10 ml of 1,2-dichloroethane are then added dropwise at 50° C. and stirring is then continued for 30 min days at this temperature. After cooling, the precipitate is filtered and recrystallised from 200 ml of 1,2-dichloroethane. 2.9 g (yield: 66%; melting point: 188° C.) of 4-chloro-3-(3,5-dibromophenyl)pyrazole are obtained.

Provenance & Evidence