PROBLEM TO BE SOLVED: To provide a radiofluorination method capable of preparing 18F aromatic fluoride (including heteroaromatic fluoride) with a high radiochemical yield. A method for synthesizing an 18F aromatic fluoride by reacting an iodonium ylide (formula D) with an 18F agent. (Z1 and Z2 are selected from the group consisting of NRZ1, O and S; RZ1 is H, C1-6 alkyl, C6-10 aryl and the like; RA and RB are H, C1-6 alkyl, and RA and RB are bonded to each other. Forming a oxo group together with a carbon atom which forms a 3-membered, 4-membered, 5-membered, 6-membered or 7-membered carbocyclic group together with the carbon atom to which RA and RB are bonded. Form a ring, Ar is an aryl group) [Selection diagram] None【課題】18F芳香族フッ化物(複素芳香族フッ化物を含む)を高い放射化学収率で調製することを可能にする放射性フッ素化方法の提供。【解決手段】ヨードニウムイリド(式D)に18F化剤を反応させる18F芳香族フッ化物の合成方法。(Z1、Z2は、NRZ1、OおよびSからなる群から選択;RZ1は、H、C1~6アルキル、C6~10アリールなど;RA、RBは、H、C1~6アルキル、RAとRBが結合している炭素原子と一緒になって、オキソ基を形成、RAとRBが結合している炭素原子と一緒になって、3員、4員、5員、6員もしくは7員の炭素環式環を形成、Arはアリール基)【選択図】なし