1.1: n-butyllithium; 2,2,6,6-tetramethyl-piperidine / tetrahydrofuran; hexane / 0.5 h / -78 - 0 °C / |Inert atmosphere; |Schlenk technique 2.1: 2,3-dicyano-5,6-dichloro-p-benzoquinone / toluene / 0.33 h / 0 °C / |Inert atmosphere 3.1: trimethylsilyl trifluoromethanesulfonate / dichloromethane / 1 h / 0 °C / |Inert atmosphere 4.1: water; sodium hydroxide / methanol / 0.5 h / |Reflux; |Inert atmosphere 5.1: Fremy’s salt / acetone / 0.33 h / 0 - 20 °C / pH 6.86 6.1: acetone / 0.5 h / 60 °C / |Sealed tube; |Inert atmosphere 6.2: 7 h / 70 °C / |Sealed tube; |Inert atmosphere View Scheme

1.1: 2,3-dicyano-5,6-dichloro-p-benzoquinone / toluene / 0.33 h / 0 °C / |Inert atmosphere 2.1: trimethylsilyl trifluoromethanesulfonate / dichloromethane / 1 h / 0 °C / |Inert atmosphere 3.1: water; sodium hydroxide / methanol / 0.5 h / |Reflux; |Inert atmosphere 4.1: Fremy’s salt / acetone / 0.33 h / 0 - 20 °C / pH 6.86 5.1: acetone / 0.5 h / 60 °C / |Sealed tube; |Inert atmosphere 5.2: 7 h / 70 °C / |Sealed tube; |Inert atmosphere View Scheme

1.1: trimethylsilyl trifluoromethanesulfonate / dichloromethane / 1 h / 0 °C / |Inert atmosphere 2.1: water; sodium hydroxide / methanol / 0.5 h / |Reflux; |Inert atmosphere 3.1: Fremy’s salt / acetone / 0.33 h / 0 - 20 °C / pH 6.86 4.1: acetone / 0.5 h / 60 °C / |Sealed tube; |Inert atmosphere 4.2: 7 h / 70 °C / |Sealed tube; |Inert atmosphere View Scheme

1.1: water; sodium hydroxide / methanol / 0.5 h / |Reflux; |Inert atmosphere 2.1: Fremy’s salt / acetone / 0.33 h / 0 - 20 °C / pH 6.86 3.1: acetone / 0.5 h / 60 °C / |Sealed tube; |Inert atmosphere 3.2: 7 h / 70 °C / |Sealed tube; |Inert atmosphere View Scheme

1.1: Fremy’s salt / acetone / 0.33 h / 0 - 20 °C / pH 6.86 2.1: acetone / 0.5 h / 60 °C / |Sealed tube; |Inert atmosphere 2.2: 7 h / 70 °C / |Sealed tube; |Inert atmosphere View Scheme

1.1: acetonitrile / 4 h / |Reflux; |Inert atmosphere 2.1: AlCl3, aluminium chloride; lithium aluminium tetrahydride / diethyl ether / 0.33 h / 0 °C / |Inert atmosphere 3.1: triethylamine / 1,2-dichloro-ethane / 10 h / 20 °C / |Inert atmosphere 4.1: sodium iodide / acetone / 5 h / |Inert atmosphere; |Reflux 5.1: n-butyllithium; 2,2,6,6-tetramethyl-piperidine / tetrahydrofuran; hexane / 0.5 h / -78 - 0 °C / |Inert atmosphere; |Schlenk technique 6.1: 2,3-dicyano-5,6-dichloro-p-benzoquinone / toluene / 0.33 h / 0 °C / |Inert atmosphere 7.1: trimethylsilyl trifluoromethanesulfonate / dichloromethane / 1 h / 0 °C / |Inert atmosphere 8.1: water; sodium hydroxide / methanol / 0.5 h / |Reflux; |Inert atmosphere 9.1: Fremy’s salt / acetone / 0.33 h / 0 - 20 °C / pH 6.86 10.1: acetone / 0.5 h / 60 °C / |Sealed tube; |Inert atmosphere 10.2: 7 h / 70 °C / |Sealed tube; |Inert atmosphere View Scheme

1: 76 percent / acetonitrile / 0.5 h / 0 °C 2: 71 percent / BBr3 / CH2Cl2 / 12 h / 0 - 25 °C 3: 86 percent / CAN / acetonitrile / 0.17 h / 0 °C 4: 36 percent / dithienyl ditelluride, NaBH4, NaOH / tetrahydrofuran; H2O / 6 h / 67 °C 5: 76 percent / 10percent NaOH / methanol / 0.5 h / 25 °C View Scheme

1: 86 percent / CAN / acetonitrile / 0.17 h / 0 °C 2: 36 percent / dithienyl ditelluride, NaBH4, NaOH / tetrahydrofuran; H2O / 6 h / 67 °C 3: 76 percent / 10percent NaOH / methanol / 0.5 h / 25 °C View Scheme

1: 36 percent / dithienyl ditelluride, NaBH4, NaOH / tetrahydrofuran; H2O / 6 h / 67 °C 2: 76 percent / 10percent NaOH / methanol / 0.5 h / 25 °C View Scheme

1: 71 percent / BBr3 / CH2Cl2 / 12 h / 0 - 25 °C 2: 86 percent / CAN / acetonitrile / 0.17 h / 0 °C 3: 36 percent / dithienyl ditelluride, NaBH4, NaOH / tetrahydrofuran; H2O / 6 h / 67 °C 4: 76 percent / 10percent NaOH / methanol / 0.5 h / 25 °C View Scheme