1: 70 percent / DBU / tetrahydrofuran / 3 h / 40 - 50 °C 2: 58 percent / 85percent aq. KOH / 5.5 h / Heating View Scheme

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