Please use this identifier to cite or link to this item: http://www.repositorio.ufop.br/handle/123456789/7564
Title: Epikatonic acid from Austroplenckia populnea : structure elucidation by nmr spectroscopy and x-ray crystallography.
Authors: Silva, Grácia Divina de Fátima
Duarte, Lucienir Pains
Viera Filho, Sidney Augusto
Doriguetto, Antônio Carlos
Mascarenhas, Yvone Primerano
Keywords: Celastraceae
Triterpene
Triterpenoids
Issue Date: 2002
Citation: SILVA, G. D. F. et al. Epikatonic acid from Austroplenckia populnea : structure elucidation by nmr spectroscopy and x-ray crystallography. Magnetic Resonance in Chemistry, Siegen, v. 40, n.5, p. 366-370, 2002. Disponível em: <http://onlinelibrary.wiley.com/doi/10.1002/mrc.1009/pdf>. Acesso em: 20 jan. 2017.
Abstract: From the chloroform extract of Austroplenckia populnea, epikatonic acid, friedelin, populnonic acid, abruslactone A, salaspermic acid and 22b-epi-maytenfolic acid were isolated. The structure and stereochemistry of epikatonic acid were established by two-dimensional NMR spectroscopic techniques (HMQC, HMBC and NOESY) and later confirmed by single crystal X-ray diffraction as 3b-hydroxyolean- 12-en-29-oic acid, which unambiguously established the configuration of the hydroxyl group at C-3 as 3b-OH and the carboxyl group at C-20 as 20a-COOH. The crystal structure shows two independent molecules in the asymmetric unit. The crystal packing is stabilized by four O–H· · ·O intermolecular hydrogen bonds, which give rise to infinite double chains along the c axis.
URI: http://www.repositorio.ufop.br/handle/123456789/7564
metadata.dc.identifier.uri2: http://onlinelibrary.wiley.com/doi/10.1002/mrc.1009/pdf
ISSN: 1097458X
Appears in Collections:DEFAR - Artigos publicados em periódicos

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