 The discovery of estrifluoromethyl diarosulfonium salts by Yagopolsky and his colleagues has led to the development of electrophilic trifluoromethylating reagents which have become widely used in the pharmaceutical, agricultural, and material industries. These reagents have been further refined and commercialized by several groups including Omomoto, Shreve, Adachi, Magner, Tani, and Shibata. The development of these reagents has allowed for the efficient and reliable trifluoromethylation of thiophenols, resulting in a wide range of applications.