[Cl:1][CH:2]1[CH2:6][N:5]([CH3:7])[C:4](=[S:8])[N:3]1[CH3:9].Cl[CH2:11][C:12](=[O:14])[CH3:13].[I-].[Na+]>CC(C)=O>[Cl-:1].[Cl:1][C:2]1[N:3]([CH3:9])[CH:4]([S:8][CH2:11][C:12](=[O:14])[CH3:13])[NH+:5]([CH3:7])[CH:6]=1To a solution of 1.00 gram (0.0062 mol) of 4-chloro-1,3-dimethyl-imidazoline-2-thione in 180 mL of acetone was added 0.569 g (0.0062 mol) of chloroacetone and a small crystal of sodium iodide. The mixture was stirred overnight at room temperature whereupon a product precipitated. The latter was recovered by filtration and recrystallized from isopropyl alcohol-hexane to obtain purified 4-chloro-1,3-dimethyl-2[-(2-oxopropyl)thio]-1H-imidazolium chloride, m.p. 134°-136° C.
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