1: 56 percent / pertrifluoroacetic acid / CH2Cl2 / 13 h / Ambient temperature 2: sodium borohydride / methanol / 3 h / Ambient temperature 3: 82 percent / p-Toluenesulfonic acid / benzene / 3 h / Heating View Scheme

(i) aq. HCl, NaNO2, (ii) /BRN= 3587244/; Multistep reaction;

1: 56 percent / pertrifluoroacetic acid / CH2Cl2 / 13 h / Ambient temperature 2: sodium borohydride / methanol / 3 h / Ambient temperature 3: 82 percent / p-Toluenesulfonic acid / benzene / 3 h / Heating View Scheme

1: 56 percent / pertrifluoroacetic acid / CH2Cl2 / 13 h / Ambient temperature 2: sodium borohydride / methanol / 3 h / Ambient temperature 3: 82 percent / p-Toluenesulfonic acid / benzene / 3 h / Heating 4: sulfurated sodium borohydride / tetrahydrofuran / 16 h / Ambient temperature 5: 1.) NaNO2, 20percent H2SO4, 2.) KI / 1.) H2O, 0 deg C, 12 min, 2.) H2O, flask in aluminum foil, 30 min stirring View Scheme

pyridine in dichloromethane T=0 - 25°C; 12.25 h;

sodium carbonate in methanol 24 h; Heating;