1: 90 percent / KOH / ethanol; H2O / Ambient temperature 2: (COCl)2 / benzene / 1 h / Heating 3: Et3N / diethyl ether / -5 - 20 °C View Scheme

potassium fluoride; potassium hydroxide; 2-(dimethylamino)-ethanol; Sn[N(SiMe3)2]2 1.) hexane, THF, 2.) THF, room temperature, 14 h; Yield given. Multistep reaction;