Used primarily as a reagent in organic synthesis, especially in the preparation of other organotin compounds. It serves as a methylating agent in various chemical transformations, transferring methyl groups to substrates under controlled conditions. Commonly applied in research laboratories for the synthesis of complex molecules, including pharmaceuticals and agrochemicals. Also utilized in the modification of polymers and surface treatments where tin-containing functional groups are required. Due to its reactivity and toxicity, handling is restricted to controlled environments with proper safety measures.