[Cl:1][C:2]1[CH2:3][C:4]2[C:9](=[O:10])[O:8][C:6](=[O:7])[C:5]=2[CH2:11][CH:12]=1.[Cl:13]N1C(=O)CCC1=O.C1C=CN=CC=1.[FH:27].C(=O)([O-])[O-].[Na+].[Na+]>C(Cl)Cl>[Cl:1][C:2]1([F:27])[CH:12]([Cl:13])[CH2:11][C:5]2[C:6]([O:8][C:9](=[O:10])[C:4]=2[CH2:3]1)=[O:7]4-chloro-3,6-dihydrophthalic anhydride (0.63 g) and N-chlorosuccinimide (0.47 g) in methylene chloride (6.2 ml) was added to pyridinium poly(hydrogen fluoride) at room temperature. The reaction mixture was stirred for 2 hours and then carefully poured into a two phase system containing solid sodium carbonate and methylene chloride. The suspension was filtered, the methylene chloride layer was dried over magnesium sulfate and the solvent removed under reduced pressure.
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