1: KMnO4, H2O / 6 h / 100 °C 2: 1.) SOCl2 / 1.) reflux, 2 h, 2.) toluene, reflux, 2 h 3: 47 percent / NaH / toluene 4: aq. 47percent HBr / 0.33 h / Heating 5: 67 percent / acetic anhydride View Scheme

1: 1.) SOCl2 / 1.) reflux, 2 h, 2.) toluene, reflux, 2 h 2: 47 percent / NaH / toluene 3: aq. 47percent HBr / 0.33 h / Heating 4: 67 percent / acetic anhydride View Scheme

1: 47 percent / NaH / toluene 2: aq. 47percent HBr / 0.33 h / Heating 3: 67 percent / acetic anhydride View Scheme

1: aq. 47percent HBr / 0.33 h / Heating 2: 67 percent / acetic anhydride View Scheme