1: 80 percent / conc. sulphuric acid / 6 h / Heating 2: 80 percent / bromine / CCl4 / 3 h / Irradiation 3: 80 percent / potassium hydroxide / ethanol; H2O; dioxane / 7 h / 100 °C 4: 85 percent / diethyl ether 5: 75 percent / 1) 180 deg C, 30 h, 2) 220 deg C, 4 h 6: BBr3 / CH2Cl2 / 10 h View Scheme