silver(l) oxide in dichloromethane T=20°C; 36 h;

1: 21 percent / Br2; AcOH / CHCl3 / 1.17 h / 0 °C 2: 84 percent / Ag2O / CHCl3 / 2 h View Scheme

1: in dichloromethane T=-10°C; 20 h; 2: With trifluoroacetic acid in methanol T=20°C; 0.0333333 h; 3: With potassium carbonate in methanol; water T=20°C; 0.0833333 h;