4 | 5-Diclorotiofeno-2-ácido carboxílico (CAS 31166-29-7) é uma impureza clorada relevante em sínteses de derivados tiofênicos. Caracteriza-se por elevada lipofilicidade relativa e tendência a permanecer em fases orgânicas; apresenta pontos de fusão e solubilidade dependentes do solvente que exigem análise específica. Identificação e quantificação recomendam HPLC com detector UV | LC-MS para confirmação de massa e RMN 1H/13C para elucidação estrutural. Estratégias de controle incluem otimização de etapas de cloração | purificação por cromatografia e limites de especificação estabelecidos conforme ICH Q3A. Monitoramento em lote a lote e estudos de estabilidade garantem redução de risco toxicológico e variabilidade do produto final.
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