hydrogenchloride in methanol T=45°C; 3 h;

1: 64 percent / pyridine / 24 h / 4 °C 2: 82 percent / pyridine / 3 h / Ambient temperature 3: 78 percent / acetone / 16 h / Ambient temperature 4: 72 percent / 1 M HCl / methanol / 3 h / 45 °C View Scheme