Hydrochloric Acid → 2,6-Dichloro-4-(2,2,2-trifluoroethylthio)-phenol

Beteiligte Stoffe

Reaktionsschritte

64 g of potassium carbonate were added to a solution of 41.9 g of 3,5-dichloro-4-hydroxy-benzenethiol in 200 ml of N,N-dimethylformamide under nitrogen atmosphere. To the stirred mixture were dropped at 30° to 40° C. 55 g of 2,2,2-trifluoroethyl-benzenesulfonate. The whole was stirred at 60° to 70° C. for 6 hours, cooled, mixed with 1.5 l of water, and acidified to pH 2 by dropwise addition of hydrochloric acid. A resulted oil was extracted with toluene and the toluene extract was washed with water. The washed toluene extracted was stirred with 160 ml of a 25% aqueous potassium hydroxide solution, and a water layer was separated. Then the separated water layer was acidified to pH 2 by adding hydrochloric acid. A resulted oil was extracted with toluene. The toluene extract was washed with water, dried over anhydrous sodium sulphate, and evaporated to give a residue. The residue was distilled under reduced pressure to give 42.3 g of 2,6 -dichloro-4-(2,2,2-trifluoroethylthio)-phenol which boiled at 85° to 88° C./1 mmHg.

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