Sodium chloromethanesulfonate is used as a sulfonating and alkylating agent in organic synthesis, particularly in the preparation of sulfonic acid derivatives. It serves as a source of the –CH₂SO₃– group in pharmaceutical and agrochemical manufacturing. Commonly employed in the modification of polymers and dyes to enhance solubility and stability. Also utilized in electroplating baths as an additive to improve metal deposition quality. Its reactivity allows for efficient introduction of sulfonate functionalities under mild conditions, making it valuable in fine chemical production.