nitric acid; acetic acid 0.75 h;

1: 97 percent / 5 N aq. HCl / ethanol / 2.5 h / Heating 2: 1.) aq. H2SO4, NaNO2, 2.) 50percent aq. H3PO2 / 1.) 0 deg C, 1 h, 2.) 5 d View Scheme