1.1: AlCl3, aluminium chloride / tetrachloroethane, 1,1,2,2- 2.1: hydrazine hydrate / diethylene glycol / 0.5 h / 20 °C 2.2: 120 - 215 °C 3.1: methanesulfonic acid / 0.5 h / 90 °C / Inert atmosphere 4.1: hydrazine hydrate / diethylene glycol / 0.5 h / 20 °C 4.2: 120 - 215 °C 5.1: AlCl3, aluminium chloride / tetrachloroethane, 1,1,2,2- / 20 °C / Cooling with ice 6.1: hydrazine hydrate / diethylene glycol / 0.5 h / 20 °C 6.2: 120 - 215 °C 7.1: sulfuric acid / Reflux View Scheme

sulfuric acid

1.1: palladium 10 on activated carbon / triglyme (triethylene glycol dimethyl ether) / 4 h / 240 °C / Inert atmosphere 2.1: methanesulfonic acid / 0.5 h / 90 °C / Inert atmosphere 3.1: hydrazine hydrate / diethylene glycol / 0.5 h / 20 °C 3.2: 120 - 215 °C View Scheme