1: 85 percent / benzene, aluminium bromide / benzene / 5 h / Ambient temperature 2: 86 percent / triethylamine / ethyl acetate / 2 h / 25 °C 3: 74 percent / N-chlorosuccinimide / CHCl3 / 3 h / Heating 4: 95 percent / aq. conc. HCl / methanol / 2 h / Heating View Scheme