Benzenesulfonic Acid Butyl Ester (CAS 80-44-4) | también conocido como Butyl Besylate o Butoxysulfonylbenzene | es una impureza orgánica que puede aparecer en procesos de sulfonación y esterificación del anillo bencénico. Su presencia compromete la pureza del lote y puede afectar la estabilidad y la cuantificación del producto final | por eso requiere monitoreo analítico riguroso. Esta impureza se identifica típicamente por GC-MS | HPLC-UV y RMN y puede hidrolizarse hasta ácido benzenosulfónico y butanol bajo condiciones acuosas. El control se basa en métodos analíticos validados y medidas de purificación como destilación fraccionada y extracción | además de estrategias preventivas en síntesis y en control de proceso.
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