کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5224233 | 1383511 | 2008 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
A study of the tautomerism of β-dicarbonyl compounds with special emphasis on curcuminoids
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
پیش نمایش صفحه اول مقاله
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چکیده انگلیسی
Six β-diketones related to curcumin and curcumin itself have been studied by 13C NMR spectroscopy in chloroform in order to determine the equilibrium constant between the two keto/enol tautomers. In order to do this GIAO/B3LYP/6-31Gââ calculations of absolute shieldings (Ï, ppm) were carried out. To establish relationships between Ï and experimental chemical shifts (δ, ppm), three simple β-diketones (acetylacetone, dibenzoylmethane and benzoylacetone) have been studied. The preference for different groups to be conjugated with the CO has been determined.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Tetrahedron - Volume 64, Issue 35, 25 August 2008, Pages 8089-8094
Journal: Tetrahedron - Volume 64, Issue 35, 25 August 2008, Pages 8089-8094
نویسندگان
Pilar Cornago, Rosa M. Claramunt, Latifa Bouissane, Ibon Alkorta, José Elguero,