4-Fenoxiftalonitrilo (CAS 38791-62-7) es una impureza orgánica frecuentemente detectada en procesos de síntesis de derivados ftalonitrílicos. Se caracteriza por su estructura aromática con grupo fenoxi y nitrilos, estabilidad térmica moderada y baja solubilidad en agua, lo que afecta la recuperación y purificación. Su identificación y cuantificación requiere técnicas analíticas específicas como HPLC con detección UV, GC-MS y espectroscopía de RMN para confirmar perfiles de impureza y justificar límites de especificación. La presencia de 4-Fenoxiftalonitrilo en niveles superiores puede alterar propiedades físicoquímicas del producto final y requiere controles de calidad, limpiezas cromatográficas y métodos de validación robustos.
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