Triethylamine → 2-[(3,4-Dichlorophenyl)sulfanyl]-5-(trifluoromethyl)-1,3,4-thiadiazole

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Reaction Steps

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.

Provenance & Evidence