1: 70 percent / NBS, (PhCOO)2 / CCl4 / 7 h / Heating 2: 53 percent / 3N HCl / ethanol / 19 h / Heating 3: ethanol / Heating 4: 97 percent / SOCl2 / CH2Cl2 / 5 h / Ambient temperature 5: 88 percent / NaH / dimethylformamide / 0.17 h / 0 °C View Scheme