1.1: hydrogenchloride; sodium nitrite / water / 0 - 5 °C 2.1: potassium carbonate / acetone / 24 h / Reflux 3.1: copper / ethyl acetate / 2 h / 200 - 220 °C / Inert atmosphere 4.1: boron tribromide / dichloromethane / 6 h / -60 - 20 °C / Inert atmosphere 4.2: Cooling with ice 5.1: pyridine; 4-(N,N-dimethlyamino)pyridine / 3 h / 60 °C View Scheme

1: lime/chalk/ / durch Destillation View Scheme