NaCH3SO3

NaCH3SO3, also known as sodium methanesulfonate or sodium mesylate, is the sodium salt of methanesulfonic acid (CH3SO3H). Its chemical formula is CH3SO3Na, consisting of a sodium cation paired with the mesylate anion CH3SO3−, a sulfonate group bearing a methyl substituent.

In physical form, sodium methanesulfonate is a white solid that is highly soluble in water. It is generally stable under ordinary conditions and does not readily decompose at room temperature. As a salt of a strong mineral acid with a weakly basic anion, it is typically used in aqueous solutions and in various chemical formulations where a non-volatile, highly soluble sulfonate salt is desired.

Preparation of sodium methanesulfonate can be achieved by neutralizing methanesulfonic acid with sodium hydroxide in water, giving the salt and water. It can also be prepared via reaction of methanesulfonyl chloride with a base such as sodium bicarbonate or sodium hydroxide, followed by purification to remove byproducts.

Typical uses of sodium methanesulfonate include serving as a convenient reagent or counterion in organic synthesis and as a precursor to other methanesulfonate derivatives. Although methanesulfonyl chloride is the more common sulfonylating agent for converting alcohols into mesylates (MsO), sodium mesylate can be converted to methanesulfonyl chloride under appropriate conditions, enabling its use in forming mesylates for downstream transformations.

Safety considerations are similar to those for many inorganic salts: handle with basic laboratory precautions to avoid dust or solution contact with eyes and skin, and avoid inhalation of any fine particulate. It is relatively non-volatile and should be stored in a dry, well-ventilated area. Related compounds include methanesulfonic acid and various mesylate derivatives.