Abstract
Thirteen (13) oxazolone derivatives were synthesized and the photochemical behavior of one of them was analyzed for solvent polarity when submitted to irradiation in 350 nm. When acetonitrile is used as solvent, photodegradation is faster when compared with n-hexane. The electronic spectra in acetonitrile showed an isosbestic point in 419 nm, indicating that only two species co-exist in solution. The addition of a second solvent destroyed this behavior. The others solvents did not show an isosbestic point.
Highlights
As oxazolonas, também conhecidas como azalactonas, são compostas heterocíclicos cuja síntese é conhecida desde o século XIX (Carter, 1946)
Thirteen (13) oxazolone derivatives were synthesized and the photochemical behavior of one of them was analyzed for solvent polarity when submitted to irradiation in 350 nm
When acetonitrile is used as solvent, photodegradation is faster when compared with n-hexane
Summary
A rota sintética empregada neste trabalho é o método clássico proposto por Plöchl-Erlenmeyer. A primeira etapa da rota consistiu na obtenção do ácido hipúrico (I), um aminoácido N-benzoilado derivado da glicina (Figura 1). Esquema reacional de síntese do ácido hipúrico (I, Ar = C6H5). Procedeu-se o fechamento do anel pela reação do ácido hipúrico com um aldeído, tendo anidrido acético como solvente e acetato de sódio como catalisador (Figura 2)
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