1: 46 percent / NaI / acetone / 31 h / Heating 2: 95 percent / zinc dust, sodium acetate / 5 h / Ambient temperature 3: 1.) chromium trioxide, conc. sulfuric acid, 2.) 6 N HCl / 1.) water, acetone, room temperature, 18 h, 2.) glacial acetic acid, 70 deg C, 30 min. 4: 87 percent / 48percent HBr / acetic acid / 5 h / Heating View Scheme

1: NaI / acetone / 31 h / Heating 2: 95 percent / zinc dust, sodium acetate 3: 1.) chromium trioxide, conc. sulfuric acid, 2.) 6 N HCl 4: 51 percent / 48percent HBr / acetic acid / Heating View Scheme

1: 46 percent / NaI / acetone / 31 h / Heating 2: 95 percent / zinc dust, sodium acetate / 5 h / Ambient temperature 3: 1.) chromium trioxide, conc. sulfuric acid, 2.) 6 N HCl / 1.) water, acetone, room temperature, 18 h, 2.) glacial acetic acid, 70 deg C, 30 min. View Scheme

1: 97 percent / sodium acetate, glacial acetic acid / 3 h / Heating 2: 85 percent / potassium carbonate / H2O; methanol / 4 h / Ambient temperature 3: 100 percent / Jones reagent / acetone / Heating View Scheme