Bupropion Des-Tbutylamino Impurity, auch als 3′-Chloropropiophenon oder m-Chloropropiophenon bezeichnet, ist ein arylisches Aliphatenketon mit der Summenformel C9H9ClO, einer Molekülmasse von 168,62 g/mol und der CAS-Nummer 34841-35-5. Die Verbindung ist strukturell als prozessbedingte Verunreinigung oder synthetischer Vorläufer im Kontext der Friedel-Crafts-Acylierung und verwandter aromatischer Ketonsynthesen einzuordnen, nicht als reaktiver heteroatomhaltiger Abbauprodukttyp. Für die Impuritätscharakterisierung sind GC-MS, LC-MS/MS sowie bei Bedarf hochauflösende Massenspektrometrie und NMR zur sicheren Strukturzuordnung erforderlich.
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