pyridine 4 h;

1: oxalyl chloride / benzene / 2 h / Ambient temperature 2: 73 percent / AlCl3 / diethyl ether / 8 h / Ambient temperature 3: 64 percent / pyridine, 10percent aq. tetramethylammonium hydroxide / 36 h / Heating 4: 95 percent / HI / various solvent(s) / 8 h / 160 °C 5: 92 percent / pyridine / 4 h View Scheme

1: 95 percent / HI / various solvent(s) / 8 h / 160 °C 2: 92 percent / pyridine / 4 h View Scheme

1: 73 percent / AlCl3 / diethyl ether / 8 h / Ambient temperature 2: 64 percent / pyridine, 10percent aq. tetramethylammonium hydroxide / 36 h / Heating 3: 95 percent / HI / various solvent(s) / 8 h / 160 °C 4: 92 percent / pyridine / 4 h View Scheme

1: 64 percent / pyridine, 10percent aq. tetramethylammonium hydroxide / 36 h / Heating 2: 95 percent / HI / various solvent(s) / 8 h / 160 °C 3: 92 percent / pyridine / 4 h View Scheme

acetic anhydride