potassium hydroxide in various solvent(s) T=200°C; 20 h;

1: zinc iodide 3: 64 percent / POCl3 / pyridine / 0.75 h / Heating View Scheme

1: methanol / 1.5 h / Heating; pH 1 2: zinc iodide 4: 64 percent / POCl3 / pyridine / 0.75 h / Heating View Scheme

1: hydrogenchloride / methanol; water / 1 h / pH 1 / |Reflux 2: zinc(II) iodide / dichloromethane / 4 h / 20 °C 3: hydrogenchloride / tetrahydrofuran; water / 4 h / 45 °C 4: thionyl chloride / 84 °C / |Sealed tube View Scheme

Yield given. Multistep reaction. Yields of byproduct given. Title compound not separated from byproducts;

potassium hydroxide in various solvent(s) T=200°C; 20 h;