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Using the procedure of Masada and Okutani (Tetrahedron 30, 409-414 (1974)) the crude 3-(4-fluorophenyl)-3H-1,2,3-oxadiazol-1-ium-5-olate (1.95 g, 10.82 mmol) was dissolved in anhydrous DMSO (27 mL) and cooled in ice. Acetyl chloride (2.0 g, 25.5 mmol) was added dropwise. The reaction mixture was allowed to come to room temperature. After stiffing overnight, the mixture was partitioned between ether and saturated NaHCO3 solution. The organic layer was washed several times with water, dried and evaporated to dryness to afford 3-(4-fluorophenyl)-4-(methylthio)-3H-1,2,3-oxadiazol-1-ium-5-olate.

1. temperaturecooled in ice
2. customto come to room temperature
3. customthe mixture was partitioned between ether and saturated NaHCO3 solution
4. washThe organic layer was washed several times with water
5. customdried
6. customevaporated to dryness