[F:1][C:2]1[CH:3]=[C:4]2[C:9](=O)[O:8][C:6](=[O:7])[C:5]2=[CH:11][CH:12]=1.[NH2:13]C(N)=O>C1(C)C=CC=CC=1>[F:1][C:2]1[CH:3]=[C:4]2[C:5](=[CH:11][CH:12]=1)[C:6](=[O:7])[NH:13][C:9]2=[O:8]To 4-fluorophthalic anhydride (5.0 g, 30.10 mmol) in toluene (15 mL) is added urea (2.1 g). The reaction mixture is stirred at refluxed for 16 h. The reaction mixture is allowed to cool to room temperature, concentrated under reduced pressure and triturated with H2O (250 mL) to afford 5-fluoro-isoindole-1,3-dione (5.0 g, 100%) as a white solid.
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