1: 1) O3-O2; 2) 30percent aq. H2O2, H2SO4 / 1) ethyl acetate, -78 deg C; 2) H2O, 2 h, reflux 2: 76 percent / acetic anhydride / 18 h View Scheme

sulfuric acid; dihydrogen peroxide; oxygen; ozone 1) ethyl acetate, -78 deg C; 2) H2O, 2 h, reflux; Yield given. Multistep reaction;

1: 1) O3-O2; 2) 30percent aq. H2O2, H2SO4 / 1) ethyl acetate, -78 deg C; 2) H2O, 2 h, reflux 2: 76 percent / acetic anhydride / 18 h 3: 42 percent / NaBH4 / propan-2-ol / 24 h / Ambient temperature View Scheme