Methanesulfonyl chloride

Methanesulfonyl chloride (CAS 124-63-0), commonly known as mesyl chloride, is a highly reactive sulfonylating agent used across pharmaceutical and agrochemical synthesis. It converts hydroxyl groups into mesylate leaving groups, enabling downstream substitution, elimination, and cyclization reactions in multi-step synthesis workflows for various industries.

In pharmaceutical manufacturing, it is used to prepare mesylate intermediates that facilitate the synthesis of active pharmaceutical ingredients where controlled stereochemistry is required. Agrochemical producers rely on it during the synthesis of herbicides, fungicides, and insecticides where sulfonylation steps are critical to building the target molecule effectively.

It also supports the preparation of sulfonamide compounds used in drug discovery and medicinal chemistry programs. Contract research organizations use it for protecting group chemistry. Methanesulfonyl chloride is supplied as a liquid in standard packaging formats ranging from small laboratory quantities to bulk drums for industrial-scale synthesis and production.

It is available in technical and high-purity grades, with reagent-grade and synthesis-grade specifications commonly offered to meet pharmaceutical and agrochemical manufacturing requirements. Buyers should confirm purity specifications and moisture-control packaging when sourcing for GMP-aligned production environments to ensure the highest quality and performance standards.