1,8-diazabicyclo[5.4.0]undec-7-ene in tetrahydrofuran T=40 - 50°C; 3 h;

1: 72 percent / DBU / tetrahydrofuran / 3 h / 40 - 50 °C 2: 89 percent / NaOH / methanol; H2O / 18 h / 50 °C 3: 67 percent / glycerol / 0.5 h / 200 °C View Scheme