Journal ArticleDOI
13C NMR spectroscopy of neolignans
Ernest Wenkert,Hugo E. Gottlieb,Otto R. Gottlieb,Marilia O. da S. Pereira,Mariza Drumond Formiga +4 more
TLDR
In this article, the 13 C NMR spectra of 15 neolignans of several structural types and two lignans were analyzed and their carbon shifts assigned, and the shifts of pyrogallol ether and ethyl phenyl carbinyl ether models were used in this connection.About:
This article is published in Phytochemistry.The article was published on 1976-01-01. It has received 96 citations till now. The article focuses on the topics: Carbon-13 NMR & Ether.read more
Citations
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Separation of Leucas aspera, a medicinal plant of Bangladesh, guided by prostaglandin inhibitory and antioxidant activities.
TL;DR: According to the traditional usage of the plant for antiinflammation and analgesia, Leucas aspera was tested for its prostaglandin (PG) inhibitory and antioxidant activities and LA-8 was determined to be (-)-chicanine, the new antipode of the (+) compound by spectroscopic methods including CD and ORD.
Journal ArticleDOI
Carbon-13 nuclear magnetic resonance spectroscopy of flavonoid and isoflavonoid compounds
Ernest Wenkert,Hugo E. Gottlieb +1 more
TL;DR: In this article, the 13 C NMR spectra of 15 flavonoid and 9 isoflavonoid substances of various ring C oxidiation states were analyzed and their carbon shifts assigned.
Journal ArticleDOI
Lignans neolignans and norneolignans from krameria cystisoides
Hans Achenbach,Johann Grob,Xorge A. Dominguez,G. Cano,Julia Verde Star,Luz Del Carmen Brussolo,Gloria Muñoz,Fernando Salgado,Leticia I. Lopez +8 more
TL;DR: The hexane extract from the roots of Krameria cystisoides yielded besides conocarpan, licarin A, eupomatenoids 6 and 13, and ratanhiaphenol I 16 hitherto unknown lignans, neolignans and nomeoligns, among them toltecol and olmecol as mentioned in this paper.
Journal ArticleDOI
13C NMR Spectroscopy of lignan and neolignan derivatives
TL;DR: In this article, 13C NMR shielding data for about 300 compounds are tabulated, and critical spectral features are discussed as a guide to the use of the technique in structure elucidation and stereochemical allocations of lignan, neolignan and their derivatives.
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New antibiotics, carbazomycins A and B. I. Fermentation, extraction, purification and physico-chemical and biological properties.
TL;DR: An unidentified Streptomyces, designated as Strain H 1051-MY 10, was proved to produce viomycin and two new antibiotics, which inhibited the growth of phytophathogenic fungi and further showed weak antibacterial and antiyeast activities.
References
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Journal ArticleDOI
Nuclear magnetic resonance spectroscopy. Carbon-13 chemical shifts of methycyclopentanes, cyclopentanols, and cyclopentyl acetates
TL;DR: In this paper, high-resolution nmr spectroscopy with the aid of proton decoupling was used to determine the chemical shifts of cyclopentane derivatives, including trans-3-methyl-and 1,3-dimethylcyclopentanols.
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Carbon-13 nuclear magnetic resonance spectra of lignins.
H.-D. Lüdemann,H. Nimz +1 more
TL;DR: From the 13C-nmr spectra of a large number of dimeric and monomeric lignin model compounds the chemical shifts of the carbon atoms of the C9-units in lignIn with different substitution patterns were determined.
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Carbon-13 nuclear magnetic resonance spectroscopy of naturally occurring substances. XXXI. Carbon-13 nuclear magnetic resonance spectral analysis of quassinoid bitter principles
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Natural occurrence of Erdtman's dehydrodiisoeugenol
TL;DR: The wood of Licaria aritu Ducke (Lauraceae) contains the neolignans licarin-A, (2 S ,3 S )-2,3-dihydro-2-(4′-hydroxy-3′-methoxyphenyl)-7- methoxy-3-methyl-5- trans -propenylbenzofuran
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The chemical constituents of Australian Zanthoxylum species. V. The constituents of Z. pluviatile Hartley; the structures of two new lignans
TL;DR: The bark of Zanthoxylum pluviatile Hartley yielded xanthyletin, hesperidin, (-)-or-oanadine methiodide, protopine, lupeol, savinin, sesamin, sucrose, and two new lignans, Pluviatilol and pluviotilide as mentioned in this paper.