1.1: potassium carbonate; 2,3-dicyano-5,6-dichloro-p-benzoquinone / benzene / 7 h / 85 °C / Inert atmosphere 2.1: dichloromethane / 27 h / 0 - 20 °C / Inert atmosphere 3.1: water; sodium hydroxide / tetrahydrofuran / 16 h / 20 - 40 °C 4.1: toluene-4-sulfonic acid / methanol / 6 h / 20 °C / Inert atmosphere 4.2: 2 h / 0 °C / Inert atmosphere 5.1: 1,8-diazabicyclo[5.4.0]undec-7-ene / N,N-dimethyl-formamide / 48 h / 110 °C 6.1: lithium aluminium tetrahydride / diethyl ether / 1 h / 50 °C / Inert atmosphere 7.1: platinum(IV) oxide; hydrogen / ethanol / 14 h / 20 °C / 760.05 Torr 8.1: triethylsilane; boron trifluoride diethyl etherate / dichloromethane / 22 h / 50 °C / Inert atmosphere View Scheme