1: 90 percent / HCl gas / CHCl3; methanol / 0.75 h / Ambient temperature 2: triethylamine / benzene / 2 h / Ambient temperature 3: acetonitrile / 24 h / 65 °C View Scheme

hydrogenchloride in methanol; chloroform 1 h; Ambient temperature;

Multi-step reaction with 2 steps 1: 90 percent / HCl gas / CHCl3; methanol / 0.75 h / Ambient temperature2: triethylamine / benzene / 2 h / Ambient temperature