1: acetic anhydride / 0.08 h / Heating 2: ZnCl2, HCl / diethyl ether / 5 h / 0 °C 3: 2.0 g / aq. potassium persulphate / aq. KOH / Ambient temperature 4: K2CO3 / acetone / 50 h / Heating 5: 1) Na, 2) conc.hydrochloric acid / 1) r.t., 2) heating, 15-20 min. View Scheme

oxalic acid diimidazolide in benzene 1.) r.t., 15 min, 2.) 68-70 deg C, 1 h;

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