Topic
Xanthone
About: Xanthone is a research topic. Over the lifetime, 1639 publications have been published within this topic receiving 25870 citations. The topic is also known as: 9-oxo-xanthene & Diphenyline ketone oxide.
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TL;DR: A xanthonolignoid, 2-O-demethylkielcorin, and a phenylxanthone, chinexanth one A, were isolated from stems of Hypericum chinense and their structures were established by spectroscopic analysis, as their optical properties and absolute stereochemistry determined.
40 citations
TL;DR: In this paper, the chemical structures of xanthones and flavonoids were determined from the bark of Anaxagorea luzonensis A. GRAY and their chemical structures were determined by means of chemical and spectral studies.
Abstract: Five new xanthones, 1,3,6-trihydroxy-5-methoxy-4-prenylxanthone (1), 1,3,5-trihydroxy-6-methoxy-2-prenylxanthone (2), 1,3,5-trihydroxy-4-(3-hydroxy-3-methylbutyl) xanthone (3), 1,3,6-trihydroxy-4-prenylxanthone (4), 3,6-dihydroxy-1,5-dimethoxyxanthone (5) and one new flavonoid, 3,5,7,4'-tetrahydroxy-2'-methoxyflavone (6) along with seven known xanthones and seven known flavonoids were isolated from the bark of Anaxagorea luzonensis A. GRAY and their chemical structures were determined by means of chemical and spectral studies. Almost all flavonoids and one xanthone (13) showed antioxidant activity.
40 citations
TL;DR: In this paper, two new xanthones, 1,5-dihydroxy-6′,6′-dimethyl-2H-pyrano(2′,3′:3,2)-6″,6″-dimethylamine 2H pyranojacareubin (2″,3″:6,7)xanthone and 1.5,6-trihydroxy-1.5-methylprop-2-enyl (1.8-deoxygartanin), were isolated from the roots
40 citations
TL;DR: An efficient new route to the benzo[ b ]xanthone system has been developed and applied to the synthesis of several new derivatives as mentioned in this paper, such as benzo-3-carboxaldehydes.
40 citations
TL;DR: In this paper, the Gibbs colour reaction is discussed and selective demethylation of methylated 1,3,5,6-tetrahydroxyxanthones occurs with acidic reagents at the 5 position and has been attributed to the presence o a pyrogallol-2-methyl ether moiety.
40 citations