in chloroform T=0°C; 24 h;

1: 90 percent / H2 / Pd/C / ethanol 2: POCl3 / CH2Cl2 / 24 h / Ambient temperature 3: 96 percent / BCl3 / CH2Cl2 / 3 h / Ambient temperature 4: 82 percent / SO2Cl2 5: 91 percent / pyridine / 18 h / Ambient temperature 6: NaClO2, NH3SO3H / tetrahydrofuran; H2O / 5.5 h / Ambient temperature 7: NaOH/H2O / ethanol / 0.75 h / Ambient temperature View Scheme

hydrogen; palladium on activated charcoal in ethanol