Multi-step reaction with 4 steps 1.1: hydrazine hydrate / 1,2-dichloro-ethane; ethanol / 28 h / 0 - 20 °C2.1: sodium hydrogencarbonate / toluene / 20 h / 20 °C3.1: lithium tetrachloropalladate / 3 h / 60 °C3.2: 2 h / 20 °C4.1: tri-cyclo-hexyl-phosphine; potassium acetate; palladium(II) dichloride bis[bis(diphenylphosphine)ferrocene] / 1,4-dioxane / 24 h / 80 °C / |Inert atmosphere