1: 79 percent / diethyl ether; methanol 2: 85 percent / 2,3-dichloro-5,6-dicyano-1,4-benzoquinone / chlorobenzene / 10 h / Heating View Scheme

1: 79 percent / diethyl ether; methanol 2: 85 percent / 2,3-dichloro-5,6-dicyano-1,4-benzoquinone / chlorobenzene / 10 h / Heating 3: 68 percent / lithium hydroxide monohydrate / H2O; 1,2-dimethoxy-ethane / 18 h / Heating 4: 68 percent / acetic anhydride / 11 h / 90 °C 5: 0.67 h / 860 °C / 0.07 Torr / flash vacuum pyrolysis View Scheme

1: 79 percent / diethyl ether; methanol 2: 85 percent / 2,3-dichloro-5,6-dicyano-1,4-benzoquinone / chlorobenzene / 10 h / Heating 3: 68 percent / lithium hydroxide monohydrate / H2O; 1,2-dimethoxy-ethane / 18 h / Heating 4: 68 percent / acetic anhydride / 11 h / 90 °C 5: 0.67 h / 860 °C / 0.07 Torr / flash vacuum pyrolysis View Scheme

1: 79 percent / diethyl ether; methanol 2: 85 percent / 2,3-dichloro-5,6-dicyano-1,4-benzoquinone / chlorobenzene / 10 h / Heating 3: 68 percent / lithium hydroxide monohydrate / H2O; 1,2-dimethoxy-ethane / 18 h / Heating 4: 68 percent / acetic anhydride / 11 h / 90 °C 5: 0.67 h / 860 °C / 0.07 Torr / flash vacuum pyrolysis View Scheme