Topic
Xanthene
About: Xanthene is a research topic. Over the lifetime, 2132 publications have been published within this topic receiving 34803 citations. The topic is also known as: Xanthene & dibenzo[a,e]pyran.
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Journal Article•
2 citations
TL;DR: In this paper, a new crystallographic form of a pure xanthenedione derivative (11 ′), C 22 H 24 O 3, was isolated from the hexane extract of the seeds of Garcinia kola.
2 citations
TL;DR: A new xanthene derivative, Hermannol (9-(7-methyl octyl)-9H-xanthene-2,3-diol) was isolated from the roots of H. geniculata and its structure was elucidated by analyses of their 1Dimensional and 2Dimensional Nuclear Magnetic Resonance, Mass Spectrometry and Infrared Spectroscopic data as discussed by the authors.
2 citations
TL;DR: The P-stereogenic bis(phosphanes) 7 and 9, featuring pairs of P(Mes)-ethynyl or vinyl substituents at the dimethyl xanthene backbone show rather low barriers of stereochemical inversion at phosphorus as mentioned in this paper .
Abstract: The P-stereogenic bis(phosphanes) 7 and 9, featuring pairs of P(Mes)-ethynyl or vinyl substituents at the dimethyl xanthene backbone show rather low barriers of stereochemical inversion at phosphorus. π-conjugative effects are probably causing these low inversion barriers. Compound 7 reacted with B(C6F5)3 to form the nine-membered heterocyclic product 10, featuring a [P]-C≡C-B(C6F5)3 substituent. Compound 7 was converted to the bis[P(Mes)vinyl] xanthene derivative 9, which gave the zwitterionic P(H)(Mes)-CH=CH-B(C6F5)3 containing product 16 upon treatment with B(C6F5)3. Thermally induced epimerization barriers at phosphorus of ca. 20 to 26 kcal mol-1 were calculated by DFT for the alkenyl-and alkynyl-P derived systems 6 to 9, 15 and 16 and experimentally determined for the examples 7 and 16.
2 citations
Patent•
22 Apr 2014
TL;DR: In this article, a xanthene-based fluorescent compound represented by the formula (I) is provided, in which an ether bond of 6-position O-benzyl part of the formula can be oxidation cleaved by cytochrome P450 molecular species 3A, n is an integer of 1 to 5 and Rs may be same or different when n is 2 or more.
Abstract: PROBLEM TO BE SOLVED: To provide a fluorescence probe for measuring activity of molecular species 3A of cytochrome P-450 having excellent cytochrome P-450 molecular species selectivity and excellent detection sensitivity.SOLUTION: There is provided a xanthene-based fluorescent compound represented by the formula (I), where Ris a monovalent group, Ris H or a monovalent group, Rand Rare H, a halogen atom or the like, Ris a monovalent group in which an ether bond of 6-position O-benzyl part of the formula (I) can be oxidation cleaved by cytochrome P-450 molecular species 3A, n is an integer of 1 to 5 and Rs may be same or different when n is 2 or more.
1 citations