What is methane sulfonyl chloride?

Methane sulfonyl chloride (also known as mesyl chloride or MSC) is a colorless liquid with a pungent odor. Its chemical formula is CH3SO2Cl, and it is commonly used in organic chemistry as a reagent for sulfonation and mesylation reactions. It is also used in the pharmaceutical industry for the synthesis of drugs and in the production of agrochemicals and polymers. MSC is highly reactive and should be handled with care due to its corrosive and toxic nature. It reacts with water to form methanesulfonic acid, which can cause eye and skin irritation, and respiratory problems if inhaled. It is also flammable and should be stored and used in a well-ventilated area away from heat and flames.