1: 1.32 g / sodium methoxide / dimethylformamide / 0.5 h / 65 - 70 °C 2: 85 percent / aq. 1 N NaOH / various solvent(s) / 3 h / 25 °C 3: 90 percent / triethylamine / xylene / 0.5 h / 115 - 120 °C View Scheme

sodium hydride 1.) DMF, 1 h, 2.) a) 60 deg C, 4 h, b) 25 deg C, 16 h; Yield given. Multistep reaction;