Friedel–Crafts alkylation of arenes with epoxides promoted by fluorinated alcohols or water

The stereoselective intra- and intermolecular Friedel-Crafts alkylation of electron-rich arenes with epoxides can take place in refluxing 1,1,1,3,3,3-hexafluoroisopropanol owing to its weak acidity and high ionizing power.