[F:1][C:2]([F:16])([F:15])[C:3]1[CH:4]=[C:5]([C:12]([OH:14])=[O:13])[C:6](=[CH:10][CH:11]=1)[C:7](O)=[O:8].C(OC(=O)C)(=O)C>CC(O)=O>[F:1][C:2]([F:16])([F:15])[C:3]1[CH:4]=[C:5]2[C:6](=[CH:10][CH:11]=1)[C:7](=[O:8])[O:13][C:12]2=[O:14]25.0 g of 4-trifluoromethyl-phthalic acid were dissolved in 50 ml of HOAc and 15.1 ml of acetic anhydride added. The mixture was refluxed for 6 h. The solvent was then removed in vacuo. The residue was treated three times with 50 ml of toluene each followed by the removal of the solvent in vacuo. Yield 23.1 g of a colorless oil (Rf(CH2Cl2)=0.60).
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