Used primarily as an intermediate in organic synthesis, especially in the pharmaceutical and agrochemical industries. It serves as a building block for sulfur-containing compounds, which are important in the development of certain active ingredients in pesticides and herbicides. Its reactivity allows for the introduction of ethylthio groups into larger molecules, enhancing lipophilicity and influencing biological activity. Also utilized in the preparation of specialty chemicals where sulfur functionality is required for desired performance, such as in flavor and fragrance compounds or in the synthesis of ligands for catalysis.