1: 1.) O3; 2.) Zn/CH3COOH / 1.) -78 deg C, 30 min; 2.) room temperature overnight. 2: 73 percent / HCl / acetic acid / 21 h / Ambient temperature 3: 81 percent / SiO2 / CHCl3 / 27 h / 60 °C View Scheme

1: 1.) O3; 2.) Zn/CH3COOH / 1.) -78 deg C, 30 min; 2.) room temperature overnight. 2: 73 percent / HCl / acetic acid / 21 h / Ambient temperature 3: Al2O3 / hexane / 24 h / 60 °C View Scheme