Introduction of fluorine into a certain position of bioactive compound such as a pharmaceutical and an agricultural chemical may remarkably reduce the toxicity of the compound, or improve the efficiency of medicine. This is due to the mimic and blocking effect characterized by fluorine. Many compounds, such as 5-fluorouracil, have been reported as success case. Attempts to efficiently synthesize fluorine-containing compounds are performed in many fields. Methods to introduce fluorine into a certain position through the use of fluorinating agents have been reported. Fluorine, difluoromethyl group, trifluoromethyl group, trifluoromethlythio group and etc. are known as below. This page shows fluorinating agents categorized by functional group insertion.