1: 72 percent / HNO3, 30percent oleum, conc. H2SO4 / 1) 5 deg C to RT, 1 h, 2) steam bath, 2 h 2: 89 percent / POCl3 / CH2Cl2 / 1) RT, 16 h, 2) reflux, 4 h 3: 53 percent / trifluoroacetic anhydride / CH2Cl2 / 168 h / Ambient temperature View Scheme

sulfuric acid; potassium nitrate

3-chloro-benzenecarboperoxoic acid in dichloromethane 16 h; Ambient temperature; Yield given;

1: 1) NaNO2, conc. HCl, 2) hexafluorophosphoric acid / 1) H2O, -5 to 0 deg C, 5 min 2: m-chloroperbenzoic acid / CH2Cl2 / 16 h / Ambient temperature View Scheme