CAS Registry Number

CAS 4052-92-0 — 3-(Chlorosulfonyl)benzoyl chloride

3-(Chlorosulfonyl)benzoyl chloride is a highly reactive aromatic sulfonyl chloride used primarily as an intermediate in organic synthesis, particularly for preparing sulfa drugs, dyes, and specialty polymers. It serves as a key building block in pharmaceutical and agrochemical manufacturing due to its ability to introduce sulfonamide functional groups. This chemical has a CAS number of 4052-92-0, with the molecular formula C7H4Cl2O3S and a molecular weight of 239.0759 g/mol. It is stable at ambient storage conditions and carries no signal word under standard handling protocols. Molekula supplies 3-(Chlorosulfonyl)benzoyl chloride from research to bulk quantities with full documentation and ISO 9001:2015 traceability.