ammonium acetate; K5CoIIIW12O40 T=115°C; 0.75 h;

copper (II) acetate monohydrate; hydrazine hydrate in N,N-dimethyl-formamide regioselective reaction;

copper (II) acetate monohydrate; hydrazine hydrate in N,N-dimethyl-formamide regioselective reaction;

sulfuryl dichloride 0.166667 h; Ambient temperature;

sodium hydrogencarbonate; hydroxylamine-o-sulphonic acid in methanol; water

sodium ethanolate in ethanol T=70°C;

1: 1.) Phosphorus oxychloride, 2.) Sodium perchlorate monohydrate / 1.) anhydr. Dichloromethane, room temp., 20 min, 0 deg C, 10 min, 2.) Dichloromethane/water, 0 deg C, 20 min 2: 73 percent / Sodium sulfide nonahydrate / dimethylformamide; H2O / 2 h / Ambient temperature 3: 65 percent / Pyridine, Hydroxylamine-O-sulfonic acid / ethanol; methanol / 0.5 h / Ambient temperature View Scheme