1: 72 percent / p-toluenesulfonic acid / benzene / 3 h / Heating 2: 98 percent / 30percent H2O2 / acetic acid / 1) RT, 2) reflux; m-chloroperbenzoic acid View Scheme

boron trifluoride diethyl etherate in dichloromethane 12 h; Ambient temperature;

3-chloro-benzenecarboperoxoic acid Multistep reaction;

1: 86 percent / tetrahydrofuran / 2 h 2: 36 percent / aq. Na2CO3, I2, aq. KI / 10 h 3: 85 percent / BBr3 / CH2Cl2 / 1.) -78 deg C, 10 min, 2.) room temperature, 5 h View Scheme

1: diisopropylethylamine / dimethylformamide / 100 °C 2: 1.24 g / chromium(II) chloride / tetrahydrofuran / 5 h / 0 °C 3: 77 percent / trifluoroacetic acid / CH2Cl2 / 1 h / 20 °C View Scheme

1: 79 percent / tetrahydrofuran / 4 h / Heating 2: 93 percent / AlCl3 / CH2Cl2 / 1 h / Ambient temperature 3: 92 percent / KOH / ethanol / 1 h / Heating 4: 66 percent / polyphosphoric acid / 2 h / 110 °C View Scheme

1: 90 percent / triethylamine / dimethylsulfoxide / 48 h / Ambient temperature 2: 95 percent / NaBH4 / dimethylsulfoxide / 1 h / Ambient temperature 3: 1.) NaOCH3, TiCl3, CH3CO2NH4, 6 N HCl, 2.) Ac2O, HClO4 / 1.) THF, H2O, RT, 1.5 h, nitrogen atmosphere, 2.) EtOAc, RT, 1 h View Scheme

1: triphenyl-methyl-phosphonium iodide With potassium tert-butylate in tetrahydrofuran T=0 - 20°C; 2: 1,3-dihydro-3-hydroxy-7-methoxyisobenzofuran-1-one in tetrahydrofuran T=0 - 20°C; Wittig olefination; 3: methyl iodide in tetrahydrofuran T=20°C; 12 h;