Methanesulfonyl chloride (mesyl chloride) is an organosulfur compound with the formula CH3SO2Cl. It is a colourless liquid that dissolves in polar organic solvents but is reactive toward water, alcohols, and many amines. The simplest organic sulfonyl chloride, it is used to make methanesulfonates and to generate the elusive molecule sulfene
M 1825 (OTTO) Methane sulphonyl chloride, 99%+ Cas 124-63-0 - used as a reagent for conversion of alcohols to mesylate esters such as methanesulfonate, which is an intermediate in substitution reactions, elimination reactions, reductions, and rearrangement reactions viz. Beckmann rearrangement.