In chemistry, Trimethylsulfoxonium Iodide is a sulfuric acid salt. By reacting with sodium hydride, it is used to form dimethyloxosulfonium methylide. This compound is a methylene-transfer reagent, and it can be used to prepare epoxides. Calibre is a leading manufacturer of TMSI that is used as an Iodization agent in the Agrochemical and Pharmaceutical industry. Our TMSI products are produced with utmost care and attention on which companies can bank upon.