silica gel in hexane; dichloromethane

1,8-diazabicyclo[5.4.0]undec-7-ene; AgCl 25 h; Heating;

1: 83 percent / hexane / 72 h / 20 °C 2: 67 percent / 1,8-diazabicyclo[5.4.0]undec-7-ene; AgCl / CH2Cl2 / 25 h / Heating 3: 100 percent / silica gel / CH2Cl2; hexane View Scheme

diisobutylaluminium hydride in toluene T=-70 - -65°C; 0.383333 h;