1: 99 percent / 5 h / 190 °C 2: 93 percent / potassium carbonate / acetone / 16 h / Heating 3: 1.) ozone, 2.) zinc, 50percent aq. acetic acid / 1.) ethyl acetate, 0 deg C, 2.) ethyl acetate, reflux, 1 h 4: 98 percent / H2 / 10percent Pd/C / ethyl acetate View Scheme

1: 99 percent / 5 h / 190 °C 2: 93 percent / potassium carbonate / acetone / 16 h / Heating 3: 1.) ozone, 2.) zinc, 50percent aq. acetic acid / 1.) ethyl acetate, 0 deg C, 2.) ethyl acetate, reflux, 1 h 4: 98 percent / H2 / 10percent Pd/C / ethyl acetate 5: 78 percent / KOH / H2O; methanol / 2 h / Heating View Scheme