1: 65 percent / ethane-1,2-diol / 7 h / 80 - 85 °C 2: 1.) NH4OH; 2.) conc. HCl / 1.) 60 - 65 deg C, 12 h; 2.) 0 - 5 deg C 3: 68 percent / 47percent HBr, AcOH / 10 h / Heating View Scheme

1: 65 percent / ethane-1,2-diol / 7 h / 80 - 85 °C 2: 1.) NH4OH; 2.) conc. HCl / 1.) 60 - 65 deg C, 12 h; 2.) 0 - 5 deg C View Scheme