in 1,2-dichloro-ethane T=70°C; 72 h; Sealed tube;

hydrazine hydrate; palladium on activated charcoal in ethanol 2.5 h; Heating;

1.1: sulfuric acid; potassium nitrate / 4 h / 2 - 5 °C 1.2: 55 percent / sulfuric acid / 2 h / 100 - 110 °C 2.1: 58 percent / arsenic pentoxide hydrate; sulfuric acid / 3 h / 150 °C 3.1: 60 percent / methylhydrazine / ethanol / 65 h / 100 °C 4.1: 86 percent / arsenic pentoxide hydrate; sulfuric acid / 2 h / 150 °C 5.1: 54 percent / hydrazine monohydrate / Pd/C / ethanol / 2.5 h / Heating View Scheme

1: 58 percent / arsenic pentoxide hydrate; sulfuric acid / 3 h / 150 °C 2: 60 percent / methylhydrazine / ethanol / 65 h / 100 °C 3: 86 percent / arsenic pentoxide hydrate; sulfuric acid / 2 h / 150 °C 4: 54 percent / hydrazine monohydrate / Pd/C / ethanol / 2.5 h / Heating View Scheme

1.1: 98 percent / 20 °C 2.1: sulfuric acid; potassium nitrate / 4 h / 2 - 5 °C 2.2: 55 percent / sulfuric acid / 2 h / 100 - 110 °C 3.1: 58 percent / arsenic pentoxide hydrate; sulfuric acid / 3 h / 150 °C 4.1: 60 percent / methylhydrazine / ethanol / 65 h / 100 °C 5.1: 86 percent / arsenic pentoxide hydrate; sulfuric acid / 2 h / 150 °C 6.1: 54 percent / hydrazine monohydrate / Pd/C / ethanol / 2.5 h / Heating View Scheme

1: 86 percent / arsenic pentoxide hydrate; sulfuric acid / 2 h / 150 °C 2: 54 percent / hydrazine monohydrate / Pd/C / ethanol / 2.5 h / Heating View Scheme

1: 60 percent / methylhydrazine / ethanol / 65 h / 100 °C 2: 86 percent / arsenic pentoxide hydrate; sulfuric acid / 2 h / 150 °C 3: 54 percent / hydrazine monohydrate / Pd/C / ethanol / 2.5 h / Heating View Scheme

sulfuric acid; meta-nitrobenzenesulfonic acid

sulfuric acid; orthoarsenic acid

sulfuric acid T=140 - 150°C;