1: 88 percent / sodium methoxide 2: 96 percent / 35percent HCl / ethanol / 1 h / Heating 3: pyridine / N,N-dimethyl-acetamide / 2 h / Ambient temperature 4: 57 percent / MnO2 / acetone 5: 1 N sodium hydroxide / 0.5 h / Ambient temperature View Scheme