1: 95 percent / I2 / CH2Cl2 / 0.5 h / Ambient temperature 2: 86 percent / MnO2 / CH2Cl2 / 2 h / Ambient temperature View Scheme

1: 95 percent / I2 / CH2Cl2 / 0.5 h / Ambient temperature 2: 86 percent / MnO2 / CH2Cl2 / 2 h / Ambient temperature 3: 53 percent / diethyl ether / 2 h / 0 °C 4: 81 percent / Pd(PPh3)4, aq. TlOH / tetrahydrofuran / 2 h / Ambient temperature 5: 54 percent / MnO2 / CH2Cl2 / 9 h / Ambient temperature View Scheme