1: 90 percent / 32percent peracetic acid / acetic acid / 2 h / Ambient temperature 2: 84 percent / Zn, AcOH / H2O / 2 h / 70 °C View Scheme

1: 90 percent / 32percent peracetic acid / acetic acid / 2 h / Ambient temperature 2: 95 percent / potassium carbonate / acetone / 1.5 h / Heating 3: 65 percent / Zn, AcOH / H2O / 1.5 h / 70 - 75 °C 4: 70 percent / pyridine hydrochloride / 1 h / 200 - 220 °C View Scheme