1: 1.) O3/O2, 2.) H2 / 2.) Pd/BaSO4 / 1.) EtOAc, -78 deg C, 7 min, 2.) EtOAc, 0 deg C 2: 52 percent / piperidine, CH3COOH / benzene / 0.5 h / Heating 3: 700 °C / 0.04 Torr / other temperatures, other products on flash vacuum pyrolysis View Scheme