[Cl:1][Sb-:2]([Cl:7])([Cl:6])([Cl:5])([Cl:4])[Cl:3].[CH3:8][O+](C)C.[Cl:12][C:13]1[S:17][N:16]=[C:15]([Cl:18])[C:14]=1[Cl:19]>>[Cl:1][Sb-:2]([Cl:7])([Cl:6])([Cl:5])([Cl:4])[Cl:3].[CH3:8][N+:16]1[S:17][C:13]([Cl:12])=[C:14]([Cl:19])[C:15]=1[Cl:18]Trichloroisothiazole (10 ml) and trimethyloxonium hexachloroantimonate (7.9 g, 0.02 mol) were heated at 90° for 30 min. After cooling either (150 ml) was added and the solid collected to yield 7.8 g (73%) of product, mp >240. Spectral data (NMR & IR) were consistent with the assigned structure.
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