manganese(IV) oxide in N,N-dimethyl-formamide 10 h; Ambient temperature;

1: 81.4 percent / manganese dioxide / dimethylformamide / 10 h / Ambient temperature 2: 74.4 percent / acetic acid; H2O / 5 h / 70 °C View Scheme

1: 81.4 percent / manganese dioxide / dimethylformamide / 10 h / Ambient temperature 2: 62 percent / copper powder / dioxane / 1) 40 deg C, 3 h 2) 70 deg C, 4 h 3: 89 percent / diethyl ether / 2 h / Ambient temperature View Scheme