CAS Registry Number

CAS 51-78-5 — 4-Aminophenol hydrochloride

4-Aminophenol hydrochloride is an aromatic amine derivative used primarily in pharmaceuticals, dyes, and photographic developers due to its reactive phenolic and amine groups. It serves as a key intermediate in the synthesis of paracetamol (acetaminophen) and other medications, as well as in the production of azo dyes and colorants. This white to off-white crystalline powder has a CAS number of 51-78-5, with the molecular formula C6H8ClNO and a molecular weight of 145.58682. It is stable under ambient storage conditions and carries no signal word for hazard classification. Molekula supplies 4-Aminophenol hydrochloride from research to bulk quantities with full documentation and ISO 9001:2015 traceability.