C6H5SO3Br

C6H5SO3Br is the chemical formula for benzenesulfonyl bromide. It is an organosulfur compound with the structure of a benzene ring substituted with a sulfonyl bromide group. This compound is a reactive electrophile and is often used as a reagent in organic synthesis. Its synthesis typically involves the reaction of benzenesulfonyl chloride with a bromide source, or the direct bromination of benzenesulfonic acid derivatives.

Benzenesulfonyl bromide is a colorless to pale yellow crystalline solid. It is sensitive to moisture and can hydrolyze to form benzenesulfonic acid and hydrobromic acid. Due to its reactivity, it should be handled with care in a well-ventilated area. Its primary applications lie in its ability to act as a sulfonylating agent, introducing the benzenesulfonyl group (C6H5SO2-) onto various nucleophiles. This is useful in the preparation of sulfonamides, sulfonates, and other sulfur-containing organic molecules. The precise conditions for its reactions, such as temperature and solvent, depend on the specific transformation desired and the nature of the nucleophile.