Used as a highly effective alkylating agent in organic synthesis, particularly for the selective introduction of methyl groups under mild conditions. It is especially valuable in the preparation of quaternary ammonium salts and in methylation reactions where traditional reagents may fail due to poor reactivity or side reactions. Its stability and solubility in a variety of organic solvents make it suitable for use in pharmaceutical synthesis, where precise and efficient methylation is required. Additionally, it serves as a reagent in the development of ionic liquids and in materials science for modifying molecular structures with pyridinium functionalities.