1.1: sodium hydride / ethylene glycol dimethyl ether / 0.17 h / 0 °C / |Schlenk technique 1.2: 1 h / 20 °C / |Schlenk technique 2.1: potassium phosphate; palladium diacetate; 2-(dicyclohexylphosphino)-2',4',6'-tri-i-propyl-1,1’-biphenyl / tert-butyl alcohol / 12 h / 90 °C / |Inert atmosphere; |Schlenk technique 3.1: Ni(PCy3)2Cl2; tri-cyclo-hexyl-phosphine; potassium carbonate / 1,4-dioxane / 24 h / 120 °C / |Inert atmosphere; |Schlenk technique 4.1: Ni(PCy3)2Cl2 / toluene / 24 h / 130 °C / |Inert atmosphere; |Schlenk technique View Scheme