4-Cloro Bupropión, también denominado 3,4-dicloro bupropión o Bupropion Impurity I, es una impureza de proceso halogenada asociada a la química del clorhidrato de bupropión. Identificada por el CAS 1193779-34-8, presenta la fórmula molecular C13H17Cl2NO.HCl y un peso molecular de 310,65 g/mol. La especie sugiere sustitución clorada en la cadena lateral o en el anillo aromático, derivada de intermediarios previos, sobrecloración o subproductos específicos de la ruta sintética. Su caracterización suele requerir LC-MS/MS, LC-MS de alta resolución y métodos HPLC ortogonales, con GC-MS como apoyo tras derivatización. En el perfil de impurezas se evalúa bajo ICH Q3A e ICH Q3B, y si aplica, bajo ICH M7.
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