5-chloro bupropion impurity

5-Chloro bupropion impurity is a structurally related synthetic byproduct arising from chlorination at the 5-position of the aromatic ring in the bupropion core. It retains the cyclohexylmethylpiperidine moiety and ketone functionality of the parent drug but features a dichlorinated benzene ring (3,5-dichloro substitution). This positional isomer exhibits distinct chromatographic and spectroscopic properties due to the meta-chlorine addition, which alters electronic and steric interactions within the molecule. It serves as a critical HPLC reference standard for quantifying process-related impurities in bupropion formulations.