1.1: copper(l) chloride; sulfuric acid / methanol / 30 - 70 °C / Inert atmosphere; Reflux 2.1: potassium carbonate; tert.-butylhydroperoxide; CuCl2·2H2O / dichloromethane / 25 - 30 °C / Inert atmosphere 3.1: trichlorophosphate / dichloromethane / 0 - 105 °C / Inert atmosphere 4.1: potassium carbonate / toluene / 25 - 115 °C / Inert atmosphere; Reflux 5.1: diisobutylaluminium hydride / dichloromethane / 0 - 5 °C / Inert atmosphere 5.2: 0 - 30 °C View Scheme