이부프로펜 알데히드 불순물, CAS 51407-46-6은 이부프로펜의 이소부틸페닐 프로피온산 골격에서 유래한 방향족 알데히드성 공정 관련 불순물이다. 분자식 C13H18O 및 분자량 190.28 g/mol은 모체 산에 비해 기능기가 감소한 구조를 나타내며, 이는 산화적 측쇄 전환 또는 합성 반응의 불완전성과 일치한다. 알데히드기는 화학적으로 반응성이 높아 해당 산으로 추가 산화되거나 쉬프 염기 형성에 관여할 수 있다. 동정과 정량에는 일반적으로 LC-MS/MS 또는 GC-MS를 이용한 직교 크로마토그래피가 요구되며, 카르보닐 환경과 위치 이성질체를 확인하기 위해 NMR이 병행된다.
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