Trimethyltin chloride is primarily used in organic synthesis as a reagent for introducing the trimethyltin group into various organic compounds. This chemical is particularly valuable in the preparation of organotin compounds, which are widely utilized in industrial applications such as catalysts, stabilizers in PVC production, and biocides. Additionally, it plays a role in the synthesis of intermediates for pharmaceuticals and agrochemicals. Its ability to form stable organotin derivatives makes it useful in research and development for creating compounds with specific properties. However, due to its high toxicity, handling requires strict safety measures to prevent exposure.