Haloperidol dimer impurity
Haloperidol dimer impurity arises from intermolecular coupling between piperidine rings of two haloperidol molecules, forming a symmetric bis(piperidinyl) linkage while retaining core butyrophenone moieties and 4-chloro substituents. This dimeric byproduct, characterized by its extended conjugated system and enhanced hydrophobicity compared to the parent API, is formed during oxidative stress or prolonged synthesis. It serves as an HPLC reference standard for quantifying dimeric impurities in haloperidol formulations.
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