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Do extrato hexânico da casca do caule de Bombacopsis glabra (Bombacaceae) foram isolados a flavona 5-hidroxi-3,6,7,8,4'-pentametoxiflavona (1) e os triterpenos lupenona, 9,19-ciclolanost-23-eno-3b,25-diol (2), (24R)-9,19-ciclolanost-25-eno-3b,24-diol (3) e (24S)-9,19-ciclolanost-25-eno-3b,24-diol (4). As estruturas foram determinadas por espectroscopia de RMN de 13C e de 1H (1D e 2D) e EM, e ainda, por comparacao com dados da literatura para os triterpenos. A confirmacao inequivoca da estrutura da flavona 1 foi realizada por um estudo de difracao de raios X. As cinco substâncias foram isoladas pela primeira vez de especies de Bombacaceae.

journal of the brazilian chemical society

Chemical Constituents from Bombacopsis glabra (Pasq.) A. Robyns: Complete ¹H and 13C NMR Assignments and X Ray Structure of 5-Hydroxy-3,6,7,8,4'-pentamethoxyflavone