1.1: tris(triphenylphosphine)ruthenium(II) chloride; zirconium tetrachloride; triethylamine / dichloromethane / 0.08 h / 22 - 24 °C / Inert atmosphere 1.2: 5 h / 24 - 45 °C / Inert atmosphere 2.1: lithium aluminium tetrahydride / diethyl ether / 0.5 h / -78 °C / Inert atmosphere View Scheme

Multi-step reaction with 4 steps 1.1: triethylamine / dichloromethane / 2 h / 22 - 24 °C / Inert atmosphere2.1: tetrahydrofuran; diethyl ether / 36 h / 0 - 24 °C / Inert atmosphere3.1: potassium tert-butylate / tetrahydrofuran / 2.5 h / 0 - 24 °C / Inert atmosphere4.1: n-butyllithium / tetrahydrofuran; hexane / 0.5 h / -78 °C / Inert atmosphere4.2: 2 h / -78 °C / Inert atmosphere