Journal ArticleDOI
13C NMR spectra of 1, 3, 6 -trihydroxy-7-methoxy-8-(3, 7 -dimethyl-2,6-octadienyl) xanthone and its dimethyl derivative
Hiok-Huang Lee,Soon Ng +1 more
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TLDR
In this paper, the 13C NMR spectra of 1, 3, 6-trihydroxy-7methoxy-8-(3, 7-dimethyl-2, 6 octadienyl)xanthone and its dimethyl derivative are discussed.About:
This article is published in Phytochemistry.The article was published on 1982-01-01. It has received 0 citations till now. The article focuses on the topics: Xanthone & Derivative (chemistry).read more
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Journal ArticleDOI
13 C NMR spectroscopy of substituted xanthones—II
A.W. Frahm,R.K. Chaudhuri +1 more
TL;DR: In this paper, the 13 C NMR chemical shifts of eleven hydroxy-, two hydroxymethoxy xanthones, and xanthone- C -glucoside, mangiferin, are presented and analyzed.
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Xanthonolignoids from Kielmeyera and Caraipa species—13C NMR spectroscopy of xanthones
João F. Castelão,O.R. Gottlieb,Roberto A. De Lima,Antonio A.L. Mesquita,Hugo E. Gottliebb,Ernest Wenkert +5 more
TL;DR: In this paper, the structure of (5S,6S)-6(or 5)-hydroxymethyl-5(or 6)-(4″-hydroxy-3″-methoxyphenyl)-2,3:3:4′,4′-(2′)-methoxyxanthono)-1,4-dioxane was proposed for kielcorin by analysis of high resolution MS and PMR spectra.
Journal ArticleDOI
Nuclear magnetic resonance spectroscopy. Carbon-13 nuclear magnetic resonance for some six-membered aromatic nitrogen heterocycles
TL;DR: In this article, high-resolution, natural-abundance C spectra have been obtained for pyridine, pyridazine, pyrimidine, pyrazine, and s-triazine and some methyl derivatives.
Journal ArticleDOI
13C NMR-spectroscopy of polymethoxyxanthones
TL;DR: In this paper, the 13 C NMR chemical shifts of eight methoxy-xanthones are reported and the methoxy substituent effects depending on substituents position as well as on shielded ring carbon position have been evaluated.
Journal ArticleDOI
1,3,6-Trihydroxy-7-methoxy-8-(3,7-dimethyl-2,6-octadienyl)xanthone from Garcinia cowa
Hiok-Huang Lee,Heng-Kee Chan +1 more
TL;DR: In this article, 1,3,6-Trihydroxy-7methoxy-8-(3,7-dimethyl-2, 6-octadienylxanthone) has been isolated from the stems of Garcinia cowa.