1: PCl5 / benzene / 0.75 h / 70 °C 2: SnCl2, HCl / diethyl ether; various solvent(s) / 60 h / Ambient temperature 3: 20percent H2SO4, acetic acid / 0.67 h / Heating 4: 90 percent / AlCl3 / CH2Cl2 / 2.33 h / Ambient temperature 5: 11 percent / potassium carbonate / dimethylformamide / 1.25 h / Heating View Scheme

1: PCl5 / benzene / 0.75 h / 70 °C 2: SnCl2, HCl / diethyl ether; various solvent(s) / 60 h / Ambient temperature 3: 20percent H2SO4, acetic acid / 0.67 h / Heating 4: 90 percent / AlCl3 / CH2Cl2 / 2.33 h / Ambient temperature 5: 71 percent / fluorure de potassium / methanol / 40 h View Scheme