Used as a sulfonium salt in organic synthesis, particularly in alkylation reactions where it serves as an alkylating agent. It is effective in transferring ethyl groups to nucleophiles, making it valuable in the preparation of substituted sulfides and in methylenation processes. Also employed in the development of photoacid generators for advanced lithography applications in semiconductor manufacturing due to its ability to release acid upon UV exposure. Its ionic nature and stability make it suitable for use in electrochemical studies and as a reagent in phase-transfer catalysis.