hydrogenchloride in ethanol; water T=60 - 70°C;

potassium hydroxide in methanol; water T=70°C;

1: potassium carbonate / acetone / 2 h / 30 °C 2: potassium hydroxide / ethanol; water / 36 h / 20 °C 3: pyridine; mercury(II) diacetate / 1 h / 110 °C 4: hydrogenchloride; water / methanol / 0.5 h / Reflux View Scheme

1: potassium hydroxide / ethanol; water / 36 h / 20 °C 2: pyridine; mercury(II) diacetate / 1 h / 110 °C 3: hydrogenchloride; water / methanol / 0.5 h / Reflux View Scheme

1: zinc(II) chloride / 1 h / Reflux 2: potassium carbonate / acetone / 2 h / 30 °C 3: potassium hydroxide / ethanol; water / 36 h / 20 °C 4: pyridine; mercury(II) diacetate / 1 h / 110 °C 5: hydrogenchloride; water / methanol / 0.5 h / Reflux View Scheme