1: CH3COOH, H2SO4 / 18 h / Heating 2: CrO3, glacial CH3COOH / 18 h / Heating 3: 66 percent / SnCl2*2H2O / ethanol / 0.75 h / 70 °C View Scheme

1: CH3COOH, H2SO4 / 18 h / Heating 2: CrO3, glacial CH3COOH / 18 h / Heating 3: 66 percent / SnCl2*2H2O / ethanol / 0.75 h / 70 °C 4: 1.) aq. HCl, NaMO2, 2.) NaN3 / 1.) 0 deg C to 5 deg C, 1 h, 2.) 15 min View Scheme

sodium hydroxide

sodium methylate in methanol 10 h;