1: 83 percent / sodium chromate; acetic anhydride; glacial acetic acid / benzene / 4 h / 70 °C 2: 95 percent / potassium borohydride / ethanol / 10 h / Heating 3: 92 percent / bromotrichloromethane; triphenylphosphine; NaHCO3 / CH2Cl2 / 6 h / Heating View Scheme

sodium chromate(VI); acetic anhydride; acetic acid in benzene T=70°C; 4 h;