Ethyl 2-(4-butyryl-2 | 3-dichlorophenoxy)acetate (CAS 2977-51-7) é uma impureza relevante em processos sintéticos que envolvem ésteres fenoxilados | originando-se tipicamente de hidrólise parcial | esterificação incompleta ou reações secundárias de acilação durante a síntese. Apresenta perfil cromatográfico distinto e pode interferir em ensaios de pureza e estabilidade | exigindo quantificação por HPLC acoplada a detectores UV ou por GC-MS e confirmação estrutural por RMN. Sua presença pode afetar rendimento e propriedades físicoquímicas do produto final | impondo limites de aceitação e medidas de controle como otimização de condições reacionais | purificação cromatográfica e testes de degradação forçada.
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