Insertion reactions of difluorocarbene generated by pyrolysis of hexafluoropropene oxide to OH bond

In the reaction of hexafluoropropene oxide (HFPO) with alcohol or phenol, although insertion reaction of difluorocarbene to OH bond and nucleophilic attack of alcohol or phenol to HFPO were competition, the insertion reaction proceeded predominantly to give fluorinated ether in the case of low nucleophilic alcohol or phenol.