Cyclopropyl(4-nitrosopiperazin-1-yl)methanone (CAS 2742659-60-3), también denominado 1-Cyclopropanecarbonyl-4-nitrosopiperazine, es una impureza nitroso que exige control riguroso en procesos sintéticos y en aseguramiento de calidad. La presencia del grupo nitroso modula polaridad y reactividad, favoreciendo su formación por oxidación de aminas secundarias durante síntesis o almacenamiento; esto puede afectar perfiles de pureza y estabilidad. Su identificación y cuantificación se realizan mediante HPLC y LC-MS con confirmación por NMR e IR para garantizar la asignación estructural. Las estrategias analíticas deben incluir estudios de estabilidad, límites según guías ICH y acciones de mitigación en proceso para minimizar su impacto.
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