Chemical constituents from Bombacopsis glabra (Pasq.) A. Robyns: Complete H-1 and C-13 NMR assignments and X ray structure of 5-hydroxy-3,6,7,8,4 '-pentamethoxyflavone
UNSPECIFIED. (2002) Chemical constituents from Bombacopsis glabra (Pasq.) A. Robyns: Complete H-1 and C-13 NMR assignments and X ray structure of 5-hydroxy-3,6,7,8,4 '-pentamethoxyflavone. JOURNAL OF THE BRAZILIAN CHEMICAL SOCIETY, 13 (2). pp. 276-280. ISSN 0103-5053Full text not available from this repository.
The flavone 5-hydroxy-3,6,7,8,4'-pentamethoxyflavone (1) and the triterpenes lupenone, 9,19-cyclolanost-23-ene-3beta,25-diol (2), (24R)-9,19-cyclolanost-25-ene-3beta,24-diol (3) and (24S)-9,19cyclolanost-25-ene-3beta,24-diol (4) were isolated from the hexane extract of the stem bark of Bombacopsis glabra (Bombacaceae). The structures were determined by C-13 and H-1 NMR (1D and 2D) and mass spectrometry, and by comparison with literature data for triterpenes. The structure of the flavone 1 was unambiguously confirmed by a X-ray diffraction study. The five substances were isolated for the first time from Bombacaceae species.
|Item Type:||Journal Article|
|Subjects:||Q Science > QD Chemistry|
|Journal or Publication Title:||JOURNAL OF THE BRAZILIAN CHEMICAL SOCIETY|
|Publisher:||SOC BRASILEIRA QUIMICA|
|Official Date:||March 2002|
|Number of Pages:||5|
|Page Range:||pp. 276-280|
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