 The discovery of estrifluoromethyl diarosulfonium salts by Jaguipalski and his colleagues was a major breakthrough in the field of trifluoromethylation. This led to the development of several electrophilic trifluoromethylating reagents, including those from the groups of Umamoto, Shreve, Adachi, Magner, Tanyi, and Shibata. These reagents are now commercially available and widely used in the pharmaceutical, agricultural, and material industries. This article was authored by Norio Shibata, Andre Matznev, and Dominique Cajard.