1: 1.) 2M aq. NaOH, 2.) conc. HCl / 1.) room temperature, 12 h, 2.) room temperature, 4 h 2: 70 percent / H2O / 2 h / 190 - 200 °C / sealed tube 3: 58 percent / sodium borohydride / pyridine / 12 h / Heating 4: 48percent HBr / Heating View Scheme