[CH3:1][NH:2][CH3:3].[N:4]([C:7]1[CH:22]=[CH:21][C:10]([O:11][C:12]2[CH:13]=[CH:14][C:15]3[S:19][N:18]=[CH:17][C:16]=3[CH:20]=2)=[C:9]([C:23]([F:26])([F:25])[F:24])[CH:8]=1)=[C:5]=[O:6]>C(#N)C>[CH3:1][N:2]([CH3:3])[C:5]([NH:4][C:7]1[CH:22]=[CH:21][C:10]([O:11][C:12]2[CH:13]=[CH:14][C:15]3[S:19][N:18]=[CH:17][C:16]=3[CH:20]=2)=[C:9]([C:23]([F:26])([F:25])[F:24])[CH:8]=1)=[O:6]5 parts of gaseous dimethylamine were passed into a solution of 33.6 parts of 5-(4'-isocyanato-2'-trifluoromethylphenoxy)-benzisothiazole in 400 parts of acetonitrile at from 10° to 20° C. and the reaction was allowed to continue for 12 hours at from 20° to 30° C., after which the solvent was removed under reduced pressure and the residue was recrystallized from chloroform. 32.7 parts (86% of theory) of 5-(4'-dimethylaminocarbonylamino-2'-trifluoromethylphenoxy)-benzisothiazole of melting point 188° C. were obtained.
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