potassium hydroxide in ethanol 4 h; Heating;

potassium hydroxide in methanol; water 4 h; Heating;

1: 65 percent / p-toluenesulphonic acid / 20 h / Heating 2: 64.5 percent / DDQ / toluene / 96 h / Heating 3: 90 percent / potassium hydroxide / aq. ethanol / 1 h / Heating 4: 30 percent / NaOEt / ethanol / 1 h / Heating View Scheme

sodium ethanolate in ethanol 1 h; Heating;

1: 72.5 percent / NaOMe / methanol / 3.5 h / Heating 2: 66 percent / potassium hydroxide / methanol; H2O / 4 h / Heating View Scheme