反应详情

130.5 g (0.66 mole) of 2-bromo-5-trifluoromethyl-1,3,4-thiadiazole were added dropwise to a solution of 98.1 g (0.66 mole) of 3,4dichloro-thiophenol and 57.6 g (0.66 mole) of triethylamine in 500 ml of ethanol. An exothermic effect was observed and a white precipitate separated out. The mixture was stirred for a further 2 hours under reflux, concentrated to half in vacuo and introduced into 1 liter of ice water. The white precipitate was filtered off, dried over phosphorus pentoxide and recrystallized from about 300 ml of petroleum ether. 147 g (76% of theory) of 2-(3',4' -dichlorophenylthio)-5-trifluoromethyl-1,3,4-thiadiazole of melting point 46° C were obtained.

1. customa white precipitate separated out
2. temperatureunder reflux
3. concentrationconcentrated to half in vacuo
4. additionintroduced into 1 liter of ice water
5. filtrationThe white precipitate was filtered off
6. dry with materialdried over phosphorus pentoxide
7. customrecrystallized from about 300 ml of petroleum ether