1.1: sodium hydride / tetrahydrofuran; mineral oil / 0.02 h / 20 °C / Inert atmosphere 1.2: 1 h / Inert atmosphere 2.1: boron trifluoride diethyl etherate / dichloromethane / 0.17 h / -78 °C / Inert atmosphere 2.2: 2.33 h / -78 - 20 °C / Inert atmosphere 3.1: [RhCl(η2:η2-cycloocta-1,5-diene)]2; tri-p-tolyl phosphite / tetrahydrofuran / 36 h / 135 °C / Inert atmosphere; sealed-tube 4.1: dipyridinium dichromate; N,N-dimethyl-formamide / 16 h / 20 °C / Inert atmosphere 5.1: sodium / 2.16 h / 0 - 20 °C / Inert atmosphere 6.1: Jone's reagent / water; acetone / 4.08 h / 0 °C / Inert atmosphere 7.1: lithium hydroxide hydrate / propan-1-ol; water / 12 h / 120 °C / Inert atmosphere 7.2: Dowex-50WX8 (H+ form) / Inert atmosphere View Scheme