Donepezil Related Compound (E/Z Mixture)

Donepezil Related Compound (E/Z Mixture) is a geometric isomeric impurity arising from the synthesis of the Alzheimer’s therapeutic agent Donepezil. It features a substituted benzene ring conjugated to a piperidine core via an ethenyl linkage, with the E/Z configuration at the double bond. The molecule incorporates a tertiary amine and an amide functional group, mirroring the parent drug’s pharmacophoric elements. The isomeric mixture results from partial equilibrium during synthetic oxidation steps. This compound serves as a critical HPLC reference standard for quantifying process-related impurities in Donepezil active pharmaceutical ingredients.