1: 80 percent / aq. ethanol; acetic acid / 0.5 h / 55 - 60 °C 2: 760 mg / 1.) 1 M sodium ethoxide; 2.) acetic acid / ethanol / 0.25 h / Ambient temperature 3: 64 percent / 6 h / 85 - 90 °C 4: 10percent HCl / methanol / 0.17 h / Ambient temperature View Scheme