sulfuric acid T=0°C; 1 h;

1: 88 percent / 1,8-diazabicyclo<5.4.0>undec-7-ene / ethyl acetate / 5 h / Heating 2: 90 percent / Jones' reagent / acetone / 24 h / Ambient temperature 3: 97 percent / 6 N HCl / acetic acid / 0.5 h / Heating 4: 98 percent / various solvent(s) / 5 h / 200 °C View Scheme

1,8-diazabicyclo[5.4.0]undec-7-ene in ethyl acetate 5 h; Heating;

1: 88 percent / 1,8-diazabicyclo<5.4.0>undec-7-ene / ethyl acetate / 5 h / Heating 2: 90 percent / Jones' reagent / acetone / 24 h / Ambient temperature View Scheme

1: 88 percent / 1,8-diazabicyclo<5.4.0>undec-7-ene / ethyl acetate / 5 h / Heating 2: 90 percent / Jones' reagent / acetone / 24 h / Ambient temperature 3: 97 percent / 6 N HCl / acetic acid / 0.5 h / Heating View Scheme

1: 88 percent / 1,8-diazabicyclo<5.4.0>undec-7-ene / ethyl acetate / 5 h / Heating 2: 90 percent / Jones' reagent / acetone / 24 h / Ambient temperature 3: 97 percent / 6 N HCl / acetic acid / 0.5 h / Heating 4: 98 percent / K2CO3 / butan-2-one / 2 h / Heating View Scheme