4-(4-Fluorobenzoyl)-3-hydroxymethylbenzonitrile (CAS 260371-16-2) es una impureza estructuralmente definida que puede aparecer en etapas finales de síntesis. Su grupo hidroximetilo y el nitrilo modifican polaridad y solubilidad | provocando desplazamientos de retención en cromatografía líquida reversa y señales características en 1H NMR y espectrometría de masas. Se detecta y cuantifica mediante HPLC-UV | LC-MS y confirmación por 13C NMR e IR. Su presencia indica rutas laterales como reducción parcial o incorporación incompleta de grupos funcionales y puede afectar el rendimiento y la pureza del lote. Se recomienda establecer límites de especificación y procedimientos de purificación y control de proceso para mitigarlo.
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