1: 91 percent / 95percent hydrazine hydrate, potassium hydroxide / ethane-1,2-diol / 4.5 h / 60 °C / Heating 2: 85 percent / Raney nickel-aluminium alloy / aq. NaOH / 3 h / 90 - 120 °C View Scheme

1: 91 percent / 95percent hydrazine hydrate, potassium hydroxide / ethane-1,2-diol / 4.5 h / 60 °C / Heating 2: 85 percent / Raney nickel-aluminium alloy / aq. NaOH / 3 h / 90 - 120 °C 3: 93 percent / lithium aluminium hydride / diethyl ether / 1.) RT, 1.5 h, 2.) reflux, 1h 4: 94 percent / 48percent hydrobromic acid, sulfuric acid / 24 h / Heating View Scheme

1: 91 percent / 95percent hydrazine hydrate, potassium hydroxide / ethane-1,2-diol / 4.5 h / 60 °C / Heating 2: 85 percent / Raney nickel-aluminium alloy / aq. NaOH / 3 h / 90 - 120 °C 3: 93 percent / lithium aluminium hydride / diethyl ether / 1.) RT, 1.5 h, 2.) reflux, 1h View Scheme

With  potassium hydroxide; hydrazine hydrate in  ethylene glycol T=60°C; 4.5 h;  Heating;