potassium carbonate T=50 - 60°C; 5 h;

1: 96 percent / 1.) dry HCl, boron trifluoride etherate, 2.) water / 1.) halogen chloride passed 10h, 10h room temperature, 2.) 90 deg C, pH=1, 60 min 2: 92 percent / pyridine / 0 °C 3: 87 percent / potasium carbonate / 5 h / 50 - 60 °C View Scheme

1: 96 percent / 1.) dry HCl, boron trifluoride etherate, 2.) water / 1.) halogen chloride passed 10h, 10h room temperature, 2.) 90 deg C, pH=1, 60 min 2: 92 percent / pyridine / 0 °C 3: 87 percent / potasium carbonate / 5 h / 50 - 60 °C View Scheme