[Cl:1][C:2]1[CH:7]=[CH:6][C:5]([OH:8])=[CH:4][C:3]=1[S:9][CH3:10].[Cl:11][C:12]1[CH:13]=[C:14]([C:19]([F:22])([F:21])[F:20])[CH:15]=[CH:16][C:17]=1Cl.[OH-].[Na+]>CS(C)=O>[Cl:11][C:12]1[CH:13]=[C:14]([C:19]([F:20])([F:21])[F:22])[CH:15]=[CH:16][C:17]=1[O:8][C:5]1[CH:4]=[C:3]([S:9][CH3:10])[C:2]([Cl:1])=[CH:7][CH:6]=150 g of 4-chloro-3-methylmercaptophenol, 62 g of 3,4-dichlorobenzotrifluoride and 12 g of sodium hydroxide are stirred in 150 ml of dimethyl sulphoxide for 6 hours at 142° C. The reaction mixture is then poured onto ice and extracted with toluene. Distillation of the organic phase yields 81 g of 3-(2'-chloro-4-trifluoromethylphenoxy)-6-chlorothioanisole with a boiling point of 158° C./0.4 mbar.
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