2-(2 | 3-dichloro-4-(2-(hydroxymethyl)butanoyl)phenoxy)acetic acid (CAS 95772-54-6) | también conocido como 2-Desmethylene-2-hydroxymethyl ethacrynic acid | es una impureza estructuralmente relacionada presente en procesos de síntesis de derivados fenoxiacéticos. Esta entidad ácida | con sustituyentes dicloro y un grupo hidroximetilo en la cadena butanoíla | puede formarse por reacciones secundarias como desmetilación parcial o acoplamiento incompleto. Su detección y cuantificación se realizan típicamente por HPLC con detección UV y LC-MS confirmatoria y NMR para identidad. La presencia de esta impureza afecta la pureza y estabilidad del lote por lo que se recomienda control en procesos | límites especificados y estrategias de purificación para minimizar su nivel.
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