1.1: Schwartz's reagent / tetrahydrofuran / 4 h / Inert atmosphere 1.2: 0.33 h / Inert atmosphere 2.1: tetrabutyl ammonium fluoride / tetrahydrofuran / 0.5 h / 0 °C / Inert atmosphere; Darkness 2.2: 1 h / 20 °C / Inert atmosphere; Darkness 3.1: chloro-trimethyl-silane; water / methanol / 0.17 h 4.1: BaMnO4 / dichloromethane / 6 h / Inert atmosphere View Scheme

Stage #1: With  Schwartz's reagent in  tetrahydrofuran Stage #2: With  pentane