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A suspension of 4-chloro-N-(4-(methylthio)phenyl)benzamide (1 g, 3.60 mmol) and Lawesson's reagent (875 mg, 2.16 mmol) in toluene (25 mL) was heated to 11 0° C. for 16 h. After cooling, toluene was removed in vacuo and the resulting solid was purified by column chromatography eluting using a gradient (hexanes to ethyl acetate/hexanes 30:70 v/v) to afford 503 mg (48%) of the title compound.

1. temperatureAfter cooling
2. customtoluene was removed in vacuo
3. customthe resulting solid was purified by column chromatography
4. washeluting