Impureza 1 | 4-benzodioxano-6-aldeído (CAS 29668-44-8) apresenta perfil analítico definido por sinal aldeídico em RMN 1H | carbono carbonílico em RMN 13C e pico m/z consistente em espectrometria de massa | além de absorção UV característica próxima a 254 nm. Tem polaridade moderada | sendo bem separado por HPLC reversa em gradiente acetonitrila/água e detectável por HPLC-MS ou GC-MS quando a volatilidade permite. Mostra tendência à oxidação em meio aquoso formando o correspondente ácido carboxílico | pelo que controles de processo recomendam monitoramento sistemático | limites especificados por lote e estratégias de purificação para reduzir seu impacto na qualidade do material.
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