1: 82 percent / N-bromosuccinimide, benzoyl peroxide / CCl4 / 5 h / Heating 2: 82 percent / acetonitrile / 48 h / Ambient temperature 3: 1.) n-butyl-lithium, 3.) iodine 4: 94 percent / lithium aluminium hydride / diethyl ether / 12 h / Ambient temperature 5: 59 percent / oxalyl chloride, dimethyl sulphoxide / CH2Cl2 6: 5 percent / boron tri-iodide, ethylene / CH2Cl2 / -20 °C View Scheme