1: 93 percent / SOCl2 2: 86 percent / CdCl2 / benzene / 1 h / Heating 3: 82 percent / H2N-NH2*H2O, KOH 4: 38 percent / 1.) NaBr, H2SO4, 2.) NaHCO3 / 1.) glac. CH3COOH, 4 h, 80 deg C, 2.) acetone, 5 h, reflux View Scheme

1: 86 percent / CdCl2 / benzene / 1 h / Heating 2: 82 percent / H2N-NH2*H2O, KOH 3: 38 percent / 1.) NaBr, H2SO4, 2.) NaHCO3 / 1.) glac. CH3COOH, 4 h, 80 deg C, 2.) acetone, 5 h, reflux View Scheme

sulfuric acid; sodium hydrogencarbonate; sodium bromide 1.) glac. CH3COOH, 4 h, 80 deg C, 2.) acetone, 5 h, reflux; Yield given. Multistep reaction;

1: 82 percent / H2N-NH2*H2O, KOH 2: 38 percent / 1.) NaBr, H2SO4, 2.) NaHCO3 / 1.) glac. CH3COOH, 4 h, 80 deg C, 2.) acetone, 5 h, reflux View Scheme