1: 58.5 percent / anhydrous potassium carbonate / butan-2-one / 192 h / Heating 2: potassium t-butoxide / toluene / 3 h / Heating 3: 84 percent / diethyl ether 4: 82 percent / N-bromosuccinimide, benzoyl peroxide / CCl4 / 5 h / Heating 5: 82 percent / acetonitrile / 48 h / Ambient temperature 6: 1.) n-butyl-lithium, 3.) iodine 7: 94 percent / lithium aluminium hydride / diethyl ether / 12 h / Ambient temperature 8: 59 percent / oxalyl chloride, dimethyl sulphoxide / CH2Cl2 9: 5 percent / boron tri-iodide, ethylene / CH2Cl2 / -20 °C View Scheme