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: In this paper, variable-β type molecular orbital calculations of the π-systems were performed, assignment of the absorption spectra being made, and a method for obtaining the equilibrium constant without knowing the absolute intensity is proposed.
Abstract: Ultraviolet absorption, fluorescence, and excitation spectra of xanthone and its hydroxyl and methoxyl derivatives were measured in sulfuric acid solutions of various acidities. The basicities (pKa’s) of these compounds were obtained from the spectral change. Variable-β type molecular orbital calculations of the π-systems were performed, assignment of the absorption spectra being made. It was confirmed that protonation occurs at the carbonyl oxygen atom. A method for obtaining the equilibrium constant without knowing the absolute intensity is proposed.
7 citations
TL;DR: Two undescribed piperidine racemates, (±)-caulophines A and B), a new N-containing xanthone derivative (3), together with six known piperidines, were isolated from the roots of Caulophyllum robustum Maxim and exhibited weak cytotoxicities against human palace cancer hela cell line.
7 citations
7 citations
TL;DR: A new peroxide of xanthone, together with five analogues, was obtained from horseradish peroxidase (HRP) catalysed biotransformation of α -mangostin this paper.
7 citations
TL;DR: A route to benzophenones based on a multistep construction of a cationic xanthone iron complex followed by nucleophilic ring-opening and a new, one-pot cyanide addition-decomplexation procedure is described in this paper.
7 citations