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Lupane triterpenoids of Salacia cordata
Assignment of 1H and 13C spectra and investigation of hindered side‐chain rotation in lupeol derivatives †
Complete 1H and 13C spectral assignments are reported for lupeol (1a) and two derivatives where the C‐30 methyl group is replaced by CH2OH (1b) and HC O (1c). Compound 1c shows conformationally… Expand
Steroid hydroxylation by Whetzelinia sclerotiorum, Phanerochaete chrysosporium and Mucor plumbeus
The fungi Whetzelinia sclerotiorum ATCC 18687, Phanerochaete chrysosporium ATCC 24725 and Mucor plumbeus ATCC 4740 were examined for their ability to perform steroid biotransformations under single… Expand
Isolation and identification by 2D NMR of two new complex saponins from Michrosechium helleri
Two complex saponins, amole F and G, were characterized and their spectra were assigned using only 1D and 2D 1H and NMR methods. Amole F and G have seven and six monosaccharides, respectively, linked… Expand
Determination of the tautomeric form of the imidazole ring of L-histidine in basic solution by carbon-13 magnetic resonance spectroscopy.
Bonducellpins A−D, New Cassane Furanoditerpenes of Caesalpinia bonduc
Four cassane furanoditerpenes, designated bonducellpins A (1), B (2), C (3), and D (4), were isolated from the roots of Caesalpinia bonduc. The 1H- and 13C-NMR spectra of all four compounds were… Expand
Carbon-13 nuclear magnetic resonance titration shifts in amino acids.
Using NMR to identify and characterize natural products.
Over the past 28 years there have been several thousand publications describing the use of 2D NMR to identify and characterize natural products. Expand
Prenylated benzophenone derivatives from Caribbean Clusia species (Guttiferae). Plukenetiones B-G and xerophenone A
Abstract Six new prenylated benzophenone derivatives plukenetiones B-G (2–7) have been isolated from the fruits of the Barbadian plant Clusia plukenetii. These structures were elucidated by the use… Expand