potassium hydroxide; hydrazine hydrate in ethanol 1 h; Heating;

phosphoric acid T=170 - 180°C; 18 h;

2: 93 percent / hydrazine hydrate, KOH / ethanol / 1 h / Heating View Scheme

1: 85 percent / sulfuric acid / benzene / 40 h / Heating 2: 65 percent / K2CO3 / acetone / 6 h / Heating 3: C2H5ONa / toluene / 17 h / Heating 4: 78 percent / NaBH4 / methanol / 0.5 h / Ambient temperature 5: 90 percent / H3PO4 (85percent) / 18 h / 170 - 180 °C View Scheme

1: 65 percent / K2CO3 / acetone / 6 h / Heating 2: C2H5ONa / toluene / 17 h / Heating 3: 78 percent / NaBH4 / methanol / 0.5 h / Ambient temperature 4: 90 percent / H3PO4 (85percent) / 18 h / 170 - 180 °C View Scheme

1: 78 percent / NaBH4 / methanol / 0.5 h / Ambient temperature 2: 90 percent / H3PO4 (85percent) / 18 h / 170 - 180 °C View Scheme

1: C2H5ONa / toluene / 17 h / Heating 2: 78 percent / NaBH4 / methanol / 0.5 h / Ambient temperature 3: 90 percent / H3PO4 (85percent) / 18 h / 170 - 180 °C View Scheme

in N,N-dimethyl-formamide T=208°C; 10 h;