1.1: sodium hydride / tetrahydrofuran; wax / 0.5 h / 0 °C / Inert atmosphere 2.1: tetrabutyl ammonium fluoride / tetrahydrofuran / 2 h / 0 °C 3.1: sodium periodate; sodium hydrogencarbonate / methanol; water / 2 h / 0 °C 4.1: n-butyllithium / tetrahydrofuran; hexane / 0.33 h / -40 °C / Inert atmosphere 4.2: 0.5 h / -40 °C / Inert atmosphere 5.1: hydrogenchloride; water / methanol / 6 h / Reflux 6.1: 10 palladium on activated charcoal; hydrogen; palladium(II) oxide hydrate / ethanol / 24 h / 20 °C View Scheme