1,2,3,4-Tetrahydro-1-naphthoesäure (CAS 1914-65-4) ist eine bicyclische aromatische Carbonsäure-Verunreinigung, die mit tetralinbasierten Synthesewegen und benzylicher Oxidationschemie assoziiert ist. Mit der Summenformel C11H12O2 und einer Molekülmasse von 176.21 g/mol repräsentiert sie die partiell hydrierte Naphthalin-Struktur und kann als prozessbedingtes Nebenprodukt oder durch oxidative Umwandlung verwandter Zwischenstufen entstehen. Aufgrund der strukturellen Nähe zu anderen kondensierten Ringsäuren ist für die Spurenidentifizierung und Quantifizierung in der regulatorischen Verunreinigungsbewertung typischerweise LC-MS/MS, HPLC mit UV-Detektion und gegebenenfalls GC-MS nach Derivatisierung erforderlich.
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