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13C-NMR Assignments for Methyls and Quaternary Carbons of the Limonoid Obacunone |
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| Authors: | Joseph K. Rugutt Nikolaus H. Fischer Marcus A. Nauman Thomas J. Schmidt Dana K. Berner |
| Affiliation: | 1. Department of Chemistry , Louisiana State University , Baton Rouge, LA, 70803, U.S.A.;2. International Institute of Tropical Agriculture , PMB 5320, Oyo Road, Ibadan, Nigeria |
| Abstract: | The high field 1H and 13C resonances of obacunone were established by a series of I D and 2D NMR experiments. The 13C-NMR signals of the five tertiary methyl groups and all quatenary carbons were unambiguously assigned. The results confirm the stereochemical assignments at all stereogenic centres. |
| Keywords: | Harrisonia abyssinica Simaroubaceae limonoid obacunone 1H nuclear magnetic resonance spectroscopy 13C nuclear magnetic resonance spectroscopy COSY NOESY DEPT HETCOR COLOC |