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: From aerial parts of Swertia longifolia Boiss.
16 citations
TL;DR: In this article, the synthesis of orcinoylhydroquinones has been achieved by photochemical Fries rearrangement of their esters, and a study of their oxidation (DDQ) shows that oxidative coupling occurs to produce a spirocyclohexenedione which can be thermally isomerised to the xanthone.
Abstract: The synthesis of orcinoylhydroquinones has been achieved by photochemical Fries rearrangement of their esters. A study of their oxidation (DDQ) shows that oxidative coupling occurs to produce a spirocyclohexenedione which can be thermally isomerised to the xanthone. The synthesis of a tetracyclic xanthone (related to bikaverin) is described.
16 citations
TL;DR: In this paper, a novel Zn(Π) xanthone-crown ether complex was synthesized and demonstrated to selectively detect HSO 4 -over other anions by fluorescence and UV-vis absorption spectroscopy.
16 citations
TL;DR: Seeds of Hypericum perforatum and H. tetrapterum were extracted with dichloromethane and methanol and investigated by chromatographic and mass spectrometric methods, and one representative xanthone, namely 1,3,6,7‐THX, was synthesized and analyzed via HPLC‐DAD/MSn and GC/MS.
Abstract: Seeds of Hypericum perforatum and H tetrapterum were extracted with dichloromethane and methanol and investigated by chromatographic and mass spectrometric methods Both species yielded a fatty oil fraction amounting to 305% and 180% of the seed weight, respectively Linoleic acid (C18:2n-6) was shown to be the predominant fatty acid constituent Moreover, xanthone derivatives, ie tetrahydroxyxanthones (THX), xanthone-glycosides and xanthone-sulfonates, were assigned in methanolic extracts For structure elucidation, one representative xanthone, namely 1,3,6,7-THX, was synthesized and analyzed via HPLC-DAD/MSn and GC/MS Total THX contents were quantitated applying a validated HPLC-DAD method, resulting in 125 g/kg (H perforatum) and 027 g/kg (H tetrapterum), respectively Moreover, the free radical scavenging capacity of the methanol extracts was tested using the DPPH antioxidant assay Both, H perforatum (IC50 = 87 mg/l) and 1,3,6,7-THX (IC50 = 30 mg/l), exhibited good DPPH free radical scavenging activity compared to Trolox (IC50 = 66 mg/l)
15 citations
TL;DR: In this article, the magnetic field effect on the hydrogen abstraction of xanthone from xanthene in SDS aqueous micellar solutions was studied using laser flash photolysis.
15 citations