Impurezas associadas a D-Phenylglycine Methyl Ester (HCl Salt) | CAS 19883-41-1 | incluem principalmente contaminação enantiomérica pelo enantiômero oposto | restos de reagentes e precursores não convertidos | subprodutos de alquilação ou desmetilação | produtos de hidrólise (ácido correspondente ou base livre) | solventes residuais e conteúdo de água e cloreto inorgânico; tais impurezas afetam pureza óptica | rendimento e estabilidade do sal. A caracterização e controle são realizados por HPLC quiral e achiral | GC para solventes | RMN e MS para identificação estrutural | Karl Fischer para água e titulação ou cromatografia iónica para teor de HCl. Estratégias de mitigação incluem recristalização | secagem controlada e otimização das condições de síntese.
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