1: sodium hydroxide / water; ethanol / 15 h / 80 °C 2: thionyl chloride / dichloromethane / 1 h / 20 °C 3: dichloromethane / 2 h / -20 - 20 °C 4: [bis(acetoxy)iodo]benzene / 1,2-dichloro-ethane / 1 h / 20 °C 5: sodium hydride / N,N-dimethyl-formamide; mineral oil / 1 h / 120 °C View Scheme