4-Phenoxyphthalonitrile (CAS 38791-62-7) é uma impureza aromática nitrilada frequentemente detectada em sínteses de compostos phthalonitrile. De natureza lipofílica e pouco solúvel em água, apresenta boa solubilidade em solventes orgânicos como diclorometano, tolueno e THF e mostra estabilidade em condições neutras, com potencial de hidrólise sob meios fortemente ácidos ou básicos. Sua presença pode alterar perfis cromatográficos, propriedades ópticas e estabilidade térmica do produto final. A sua quantificação realiza-se por métodos validados como HPLC, GC-MS, LC-MS e RMN, e é habitualmente controlada por purificação por recristalização, cromatografia em coluna ou HPLC preparativa para níveis tipicamente inferiores a 0,1%.
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