Ring-opening fluorinationreactions of epoxides using tetrabutylammonium bifluoride (TBABF)-KHF2, or Et3N-3HF under microwave irradiation were applied for the introduction of a fluorineatom into the carbohydrate molecules. When TBABF-KHF2 was used as the fluorination reagent, a fluorineatom was introduced regioselectively and various functional groups can tolerate the conditions. When Et3N-3HF was