CAS Registry Number

CAS 24057-28-1 — Pyridinium p-toluenesulfonate [PPTS]

Pyridinium *p*-toluenesulfonate (PPTS) is a mild acid catalyst widely used in organic synthesis for acetalization, esterification, and dehydration reactions. It is a solid, thermally stable reagent that avoids the harsh conditions of stronger acids while maintaining high yields. This chemical has a CAS number of 24057-28-1, with the molecular formula C12H13NO3S and a molecular weight of 251.30 g/mol. It is stored at ambient conditions and carries a signal word of *Warning* for safety. Molekula supplies PPTS from research to bulk quantities with full documentation and ISO 9001:2015 traceability.