1: 98 percent / diethyl ether 2: 84 percent / DIBAL-H / toluene / 1 h / 20 °C 3: 98 percent / pyridine 4: 68 percent / ozone; triphenylphosphane / CH2Cl2; methanol 5: hydroxylamine hydrochloride; sodium acetate / ethanol 6: 1.52 g / sodium acetate / acetic anhydride / Heating 7: potassium hydroxide / methanol / 2 h / Heating 8: 95 percent / triphenylphosphane / CCl4 / 2 h / Heating 9: 91 percent / 1 h / 130 °C View Scheme

1: 98 percent / diethyl ether 2: 84 percent / DIBAL-H / toluene / 1 h / 20 °C 3: 98 percent / pyridine 4: 68 percent / ozone; triphenylphosphane / CH2Cl2; methanol 5: hydroxylamine hydrochloride; sodium acetate / ethanol 6: 1.52 g / sodium acetate / acetic anhydride / Heating 7: potassium hydroxide / methanol / 2 h / Heating 8: 96 percent / triphenylphosphane / CCl4 / 2 h / Heating 9: 92 percent / 1 h / 130 °C View Scheme