CAS Registry Number

CAS 5538-51-2 — Acetylsalicyloyl chloride

Acetylsalicyloyl chloride is an acyl chloride derivative of acetylsalicylic acid (aspirin), primarily used as an intermediate in organic synthesis for producing esters, amides, and other derivatives. It is also employed in pharmaceutical research for modifying drug structures and in the preparation of specialty chemicals. This chemical has a CAS number of 5538-51-2 and does not require a signal word under standard hazard classification. It is typically supplied as a white to off-white solid with a pungent odor, requiring careful handling due to its reactivity with moisture. Molekula supplies Acetylsalicyloyl chloride from research to bulk quantities with full documentation and ISO 9001:2015 traceability.