Impureza N1-(5-acetylpyridin-2-yl)-N2-(5-chloropyridin-2-yl)ethanediamide, también referida como N1-(5-acetylpyridin-2-yl)-N2-(5-chloropyridin-2-yl)oxalamida, presenta núcleo piridínico sustituido con grupos acetilo y cloro que afectan polaridad y comportamiento cromatográfico. Esta impureza puede formarse por acoplamiento incompleto o reacciones secundarias durante síntesis de oxalamidas, y constituye un riesgo para cumplimiento de especificaciones de producto. Su perfil analítico requiere métodos LC-MS para identificación y HPLC con detección UV para cuantificación, complementados por RMN para confirmación estructural y estudios de estabilidad forzados para evaluar degradación. Se recomienda establecer límites en especificación, controles de proceso y procedimientos de purificación para mitigación. Las propiedades fisicoquímicas como polaridad e ionización influyen en la elección de fases estacionarias y gradientes.
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