(E)-N-(3-(4 | 5-dimethoxy-2-nitrophenyl)-3-oxoprop-1-en-1-yl)-N-methylnitrous amide es una impureza relevante en procesos sintéticos que contiene un núcleo nitroaromático y un sistema enona conjugado | lo que le confiere absorción UV marcada y comportamiento estable frente a condiciones de purificación estándar. Su detección y cuantificación se realizan típicamente por HPLC acoplado a detector UV y LC-MS para confirmar la masa | complementados con 1H/13C NMR e IR para caracterización estructural. La presencia de esta impureza puede afectar rendimiento y perfil de degradación del material de partida | por lo que se recomienda control mediante optimización de reacción | cromatografía preparativa o recristalización y establecimiento de límites en el control de calidad.
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