hydrogenchloride in water 2 h; Ambient temperature; Yield given;

hydrogenchloride; tetrabutylammomium bromide; potassium carbonate; potassium hydrogencarbonate 1) 2 h, reflux, 2) CH2Cl2, 4 h, 20-25 deg C; Yield given;

water in benzene T=80°C; 1 h; Yield given;