versão On-line ISSN 1678-7064
FACUNDO, Valdir A.; MORAIS, Selene M. e BRAZ FILHO, Raimundo. Chemical constituents of Ottonia corcovadensis Miq. from Amazon forest: 1h and 13c chemical shift assignments. Quím. Nova [online]. 2004, vol.27, n.1, pp. 79-83. ISSN 1678-7064. http://dx.doi.org/10.1590/S0100-40422004000100017.
In an ethanolic extract of leaves of Ottonia corcovadensis (Piperaceae) were identified sixteen terpenoids of essential oil and the three flavonoids 3',4',5,5',7-pentamethoxyflavone (1), 3',4',5,7-tetramethoxyflavone (2) and 5-hydroxy-3',4',5',7-tetramethoxyflavone (3) and cafeic acid (4). Two amides (5 and 6) were isolated from an ethanolic extract of the roots. The structures were established by spectral analysis, meanly NMR (1D and 2D) and mass spectra. Extensive NMR analysis was also used to complete 1H and 13C chemical shift assignments of the flavonoids and amides. The components of the essential oil were identified by computer library search, retention indices and visual interpretation of mass spectra.
Palavras-chave : Ottonia corcovadensis; Piperaceae; terpenoids; flavonoids; cafeic acid; amides.