An unusual [2+2] cycloadduct of terpenoid coumarin from Ethulia vernonioides
1993
Schuster, N. | Christiansen, C. | Jakupovic, J. | Mungai, M.
The leaves of Ethulia vernonioides contain an unusual [2+2] cycloadduct product of a co-occurring monoterpenoid 5-methyl coumarin precursor. The structures were elucidated by means of high field NMR spectroscopy. Photochemical transformation of precursor afforded the cycloadduct.
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