Cyanomethylethanethioate is primarily utilized in organic synthesis as a reagent for introducing thioester and nitrile functional groups into target molecules. Its unique structure makes it valuable in the preparation of complex organic compounds, particularly in pharmaceutical research where thioesters and nitriles are key intermediates. Additionally, it serves as a building block in the synthesis of agrochemicals, contributing to the development of pesticides and herbicides. In materials science, it is employed in the creation of specialized polymers and coatings, leveraging its reactivity to modify surface properties. Its application in chemical synthesis is often favored due to its ability to facilitate selective transformations under mild conditions.