potassium hydroxide in methanol 0.5 h; Heating;

1: 93 percent / copper(II) acetate / dimethylformamide / 0.5 h / 100 °C 2: 89 percent / pyridine / 0.5 h / Heating 3: 88 percent / various solvent(s) / 1.5 h / 100 °C 4: 52 percent / POCl3 / 1 h / Heating 5: 49 percent / various solvent(s) / 1.25 h / 80 °C 6: 85 percent / KOH / methanol / 0.5 h / Heating View Scheme

1: 63 percent / sodium sulphide, sulphur / ethanol; H2O / 0.5 h / Heating 2: 93 percent / copper(II) acetate / dimethylformamide / 0.5 h / 100 °C 3: 89 percent / pyridine / 0.5 h / Heating 4: 88 percent / various solvent(s) / 1.5 h / 100 °C 5: 52 percent / POCl3 / 1 h / Heating 6: 49 percent / various solvent(s) / 1.25 h / 80 °C 7: 85 percent / KOH / methanol / 0.5 h / Heating View Scheme

1: ethyl acetate / 1 h / Heating 2: 63 percent / sodium sulphide, sulphur / ethanol; H2O / 0.5 h / Heating 3: 93 percent / copper(II) acetate / dimethylformamide / 0.5 h / 100 °C 4: 89 percent / pyridine / 0.5 h / Heating 5: 88 percent / various solvent(s) / 1.5 h / 100 °C 6: 52 percent / POCl3 / 1 h / Heating 7: 49 percent / various solvent(s) / 1.25 h / 80 °C 8: 85 percent / KOH / methanol / 0.5 h / Heating View Scheme

1: 49 percent / various solvent(s) / 1.25 h / 80 °C 2: 85 percent / KOH / methanol / 0.5 h / Heating View Scheme