pyridine; tetreamethyl ammonium hydroxide in water 24 h; Heating;

in water T=200°C; 6 h; Inert atmosphere;

1: boron tribromide / dichloromethane / 1 h / 0 °C / Inert atmosphere 2: water / 6 h / 200 °C / Inert atmosphere View Scheme

1: oxalic acid dichloride / benzene / 1 h / Heating 2: 64.9 percent / AlCl3 / 1) ether, reflux, 1h, 2) r.t., 24h 3: 91.5 percent / pyridine, tetramethylammoniumhydroxid / H2O / 24 h / Heating View Scheme

1: 64.9 percent / AlCl3 / 1) ether, reflux, 1h, 2) r.t., 24h 2: 91.5 percent / pyridine, tetramethylammoniumhydroxid / H2O / 24 h / Heating View Scheme