manganese(IV) oxide in dichloromethane 42 h; Ambient temperature;

1: 1) Mg / 1) ether 2) ether, 0 deg C, 15 min then 0 deg C to room temp., 30 min 2: 58 percent / MnO2 active / CH2Cl2 / 42 h / Ambient temperature View Scheme

1: 1) Mg / 1) ether 2) ether, 0 deg C, 15 min then 0 deg C to room temp., 30 min 2: 58 percent / MnO2 active / CH2Cl2 / 42 h / Ambient temperature View Scheme

1: 1) NaH / 1) THF, r.t. 2) THF, 60 deg C, 20 h 2: 90 percent / SiO2, H2O, oxalic acid / CH2Cl2 / 0.25 h / Ambient temperature 3: 1) Mg / 1) ether 2) ether, 0 deg C, 15 min then 0 deg C to room temp., 30 min 4: 58 percent / MnO2 active / CH2Cl2 / 42 h / Ambient temperature View Scheme

1: 90 percent / SiO2, H2O, oxalic acid / CH2Cl2 / 0.25 h / Ambient temperature 2: 1) Mg / 1) ether 2) ether, 0 deg C, 15 min then 0 deg C to room temp., 30 min 3: 58 percent / MnO2 active / CH2Cl2 / 42 h / Ambient temperature View Scheme