1: 80 percent / acetic acid / ethanol / 5 h / Heating 2: 1.) sodium nitrite, HCl / 1.) gl. acetic acid, 0-5 deg C, 2.) pyridine, RT, overnight 3: 80 percent / 20percent H2O2, FeSO4, H2SO4 / ethanol / 3 h / 100 °C View Scheme

1: 1.) sodium nitrite, HCl / 1.) gl. acetic acid, 0-5 deg C, 2.) pyridine, RT, overnight 2: 80 percent / 20percent H2O2, FeSO4, H2SO4 / ethanol / 3 h / 100 °C View Scheme

1: 80 percent / acetic acid / ethanol / 5 h / Heating 2: 1.) sodium nitrite, HCl / 1.) gl. acetic acid, 0-5 deg C, 2.) pyridine, RT, overnight 3: 80 percent / 20percent H2O2, FeSO4, H2SO4 / ethanol / 3 h / 100 °C View Scheme