1: 90 percent / m-chloroperbenzoic acid / CHCl3 / 2.5 h / Ambient temperature 2: 48 percent / fuming HNO3, conc. H2SO4 / 1 h / 60 °C 3: 78 percent / NaOCH3 / methanol / 2 h / Ambient temperature 4: 85 percent / PBr3 / CHCl3 / 0.5 h / 60 °C 5: 1.) NiCl2*6H2O, Ph3P, Zn powder / 1.) DMF, 50 deg C, 1 h; 2.) DMF, 50 deg C, 2 h; other cond.: Cu, KI, DMF or Pd/C, phase transfer conditions 6: 85 percent / m-chloroperbenzoic acid / CHCl3 / 8 h / Ambient temperature 7: 60 percent / 48percent aq. HBr / 5 h / 120 °C View Scheme

1: 78 percent / NaOCH3 / methanol / 2 h / Ambient temperature 2: 85 percent / PBr3 / CHCl3 / 0.5 h / 60 °C 3: 1.) NiCl2*6H2O, Ph3P, Zn powder / 1.) DMF, 50 deg C, 1 h; 2.) DMF, 50 deg C, 2 h; other cond.: Cu, KI, DMF or Pd/C, phase transfer conditions 4: 85 percent / m-chloroperbenzoic acid / CHCl3 / 8 h / Ambient temperature 5: 60 percent / 48percent aq. HBr / 5 h / 120 °C View Scheme

1: 82 percent / 15percent H2O2, conc. HCl 2: 38 percent 3: 54 percent / acetic anhydride, 30percent H2O2 4: 42 percent / 100percent HNO3/ 100percent H2SO4 containing 10percent SO3 5: Ambient temperature 6: PCl3 7: 25 percent / dimethylformamide / 4 h / 50 °C 8: 41 percent / Ac2O, H2O2 9: 30 percent / 33percent HBr, acetic acid / acetic acid / 4 h View Scheme

1: 38 percent 2: 54 percent / acetic anhydride, 30percent H2O2 3: 42 percent / 100percent HNO3/ 100percent H2SO4 containing 10percent SO3 4: Ambient temperature 5: PCl3 6: 25 percent / dimethylformamide / 4 h / 50 °C 7: 41 percent / Ac2O, H2O2 8: 30 percent / 33percent HBr, acetic acid / acetic acid / 4 h View Scheme

dihydrogen peroxide 8 h; Ambient temperature;

1: m-chloroperbenzoic acid 2: 60 percent / 48percent HBr / 120 °C View Scheme

1: 80 percent / Br2, conc. HCl / 1 h 3: 42 percent / NiCl2*6H2O/(C6H5)3P, Zn / 4 h / 50 °C 4: 27 percent / 30percent H2O2, (CH3CO)2O / 14 h / 100 °C 5: 92 percent / Na / 0.25 h / Heating 6: 77 percent / 33percent HBr/CH3COOH / 5 h / Heating View Scheme

1: 42 percent / NiCl2*6H2O/(C6H5)3P, Zn / 4 h / 50 °C 2: 27 percent / 30percent H2O2, (CH3CO)2O / 14 h / 100 °C 3: 92 percent / Na / 0.25 h / Heating 4: 77 percent / 33percent HBr/CH3COOH / 5 h / Heating View Scheme

2: 42 percent / NiCl2*6H2O/(C6H5)3P, Zn / 4 h / 50 °C 3: 27 percent / 30percent H2O2, (CH3CO)2O / 14 h / 100 °C 4: 92 percent / Na / 0.25 h / Heating 5: 77 percent / 33percent HBr/CH3COOH / 5 h / Heating View Scheme

1: 27 percent / 30percent H2O2, (CH3CO)2O / 14 h / 100 °C 2: 92 percent / Na / 0.25 h / Heating 3: 77 percent / 33percent HBr/CH3COOH / 5 h / Heating View Scheme