[O:1]([C:8]1[N:13]=[C:12]([C:14]([F:17])([F:16])[F:15])[CH:11]=[CH:10][N:9]=1)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[Cl:18][S:19](O)(=[O:21])=[O:20]>ClC(Cl)C.C(Cl)Cl>[F:15][C:14]([F:17])([F:16])[C:12]1[CH:11]=[CH:10][N:9]=[C:8]([O:1][C:2]2[CH:3]=[CH:4][C:5]([S:19]([Cl:18])(=[O:21])=[O:20])=[CH:6][CH:7]=2)[N:13]=1To a solution of 2-phenoxy-4-trifluoromethylpyrimidine (3.0 g, 12.5 mmol, prepared under a) in dichloroethane (30 ml) was added a solution chlorosulfonic acid (10.2 g, 88 mmol) in DCM (20 ml). The reaction mixture was stirred 7 h at 50° C. Subsequently the reaction mixture was slowly quenched with water and extracted with MTBE. The organic layer was washed with water and dried and the solvent was removed in vacuo. The residue was suspended in n-pentane and stirred for 10 minutes. Filtration yielded 4-(4-trifluoromethylpyrimidin-2-oxy)benzenesulfonyl chloride as a brownish solid (1.5 g). 1H-NMR (CDCl3): δ=7.5 (m, 3H), 8.17 (m, 2H), 8.9 ppm (m, 1H).
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