magnesium oxide in acetic acid T=80 - 90°C;

1: 1.) conc. H2SO4, 5N NaNO2, 2.) 10percent HCl / 1.) H20, glacial acetic acid, 0 deg C - 5 deg C, 2.) H2O, glacial acetic acid, below 5 deg C 2: MgO / acetic acid / 80 - 90 °C View Scheme