1: 98 percent / magnesium sulfate / CH2Cl2 / 1 h / Heating 2: 100 percent / bromine / CH2Cl2 / 0.5 h / 20 °C 3: 87 percent / sodium borohydride / methanol / 2 h / Heating View Scheme

1: 100 percent / bromine / CH2Cl2 / 0.5 h / 20 °C 2: 87 percent / sodium borohydride / methanol / 2 h / Heating View Scheme

in N,N-dimethyl-formamide T=70°C; 20 h;