1: 2.) water / 1.) ether, -78 deg C, 30 min, 2.) from -78 deg C to RT 2: 81 percent / chromium trioxide, pyridine / CH2Cl2 / 3 h / 0 °C 3: NaNH2 / benzene / 12 h / Heating View Scheme

1: 2.) water / 1.) ether, -78 deg C, 30 min, 2.) from -78 deg C to RT 2: 81 percent / chromium trioxide, pyridine / CH2Cl2 / 3 h / 0 °C 3: LiNH2 / benzene / 90 h / Heating View Scheme