![]() ![]() Selective mono-acetylation of compound of 3 led to the active natural compound hallerone ( 5). ![]() Due to this instability, and although its presence in plants has been previously reported, the spectroscopical data of 3 are reported herein for the first time. Compound 3 was proven to easily evolve to rengyolone. obscura showed the presence of compound 3 as the only phenylethanoid. The ethanol extraction of freshly collected D. obscura in approximately 90% purity from fresh plant from the CHCl 3 soluble fraction of the ethanolic extract (0.8% yield). Pure rengyolone ( 1) can be obtained from D. obscura was used for the selective extraction of the natural compound rengyolone ( 1) and the aglycone of cornoside (compound 3). The content in phenylethanoids of Digitalis obscura has been studied. Cardenolide-free extracts from Digitalis obscura showed significant antifeedant effects against the aphid Myzus persicae and this activity correlated with their phenylethanoid content. ![]()
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