1.1: boron trifluoride diethyl etherate / tetrahydrofuran / 0.08 h / -15 - -10 °C / Inert atmosphere 1.2: 0.5 h / -15 - 5 °C / Inert atmosphere 1.3: 2 h / 20 °C / Inert atmosphere 2.1: copper(l) iodide; bis-triphenylphosphine-palladium(II) chloride; diisopropylamine / tetrahydrofuran / 0.75 h / 20 °C / Inert atmosphere 2.2: 50 °C / Inert atmosphere 3.1: methanol; potassium carbonate / tetrahydrofuran / 20 °C 4.1: 1,2-dichloro-benzene / 200 °C / Inert atmosphere View Scheme

1: With hydrogenchloride in water T=20°C; 0.333333 h; 2: With sodium nitrite in water T=4°C; 0.5 h; 3: With potassium iodide in water T=20 - 60°C; 1.75 h;