Bupropion Des-Tbutylamino Impurity, also described as 3'-chloropropiophenone or m-chloropropiophenone, is an aryl alkyl ketone of formula C9H9ClO and molecular weight 168.62 g/mol, CAS 34841-35-5. It is structurally consistent with a synthetic precursor or process-related impurity arising from Friedel-Crafts acylation chemistry or related aromatic ketone manufacture, rather than a reactive heteroatom-containing degradant. The compound is relevant in impurity profiling because halogenated propiophenones may persist through downstream synthesis and can be monitored by GC-MS, LC-MS/MS, and, where needed, high-resolution mass spectrometry and NMR for structural confirmation.
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