1.1: MeSO3H / methanol / 8 h / Heating 1.2: 89 percent / Ba(OH)2*8H2O / methanol / 2 h / Heating 2.1: ozone / CH2Cl2 / 0.42 h / -78 °C 2.2: PPh3 / CH2Cl2 / 2 h / -78 °C 2.3: 86 percent / N-iodosuccinimide; N-tetrabutylammonium iodide / CH2Cl2 / 0.25 h / 20 °C 3.1: 94 percent / H2; quinoine / Lindlar catalyst / pentane / 4 h / 0 °C View Scheme