La impureza aldehído de ibuprofeno, CAS 51407-46-6, es una impureza de proceso de naturaleza aromática aldehídica, derivada estructuralmente del motivo ácido propiónico isobutilfenilo de ibuprofeno. Su fórmula molecular, C13H18O, y su peso molecular, 190.28 g/mol, reflejan una funcionalidad menor que la del ácido progenitor, compatible con transformación oxidativa de la cadena lateral o conversión sintética incompleta. El grupo aldehído es químicamente reactivo y puede oxidarse a su ácido correspondiente o formar bases de Schiff. Su caracterización suele requerir cromatografía ortogonal con LC-MS/MS o GC-MS, frecuentemente complementada por RMN para confirmar el entorno carbonílico y la identidad posicional.
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