- Water-Assisted/Water-Accelerated Photoreaction of trans-2,3,4′,5-Tetrahydroxystilbene-2- O-β- d -glucoside from the Roots of Polygonum multiflorum
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The photoreaction of 2,3,4′,5-tetrahydroxystilbene-2-O-β-d-glucoside (TSG) has been investigated. Water-assisted/water-accelerated photodimerization of trans-TSG favored the formation of syn-head-to-tail [2 + 2] photocyclobutane under 365 nm irradiation as a result of hydrophobic association and a fluorescent solute-solute aggregate from their excited singlet states. In contrast, irradiation with 254 nm led to [2 + 2] photocycloreversion. The two cyclobutane dimers were first obtained through straightforward photoreaction and identified as multiflorumiside A and multiflorumiside C through the detailed analysis of high-resolution electrospray ionization mass spectrometry and one- and two-dimensional nuclear magnetic resonance. Therefore, trans-TSG should be protected from light and water.
- Bao, Ni-Man,Dai, Jin,Liao, Ning-Ling,Ying, Wen-Feng,Zhao, Rong-Hua
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- Total Synthesis of Two Glycosylated Stilbenes, Oxyresveratrol 2-O-β- d -Glucopyranoside and 2,3,5,4′-Tetrahydroxystilbene 2-O-β- d -Glucopyranoside
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Glycosylated stilbenes are biologically active secondary metabolites of plants and have the potential to alleviate a broad range of human diseases. However, some of these compounds are not naturally abundant, and thus the synthesis of such molecules is de
- Kumar, Sunil,Lee, Hsueh-Yun,Liou, Jing-Ping
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p. 1294 - 1301
(2017/05/31)
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- Isomeric effect on H/D exchange of resveratrol studied by NMR spectroscopy
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Resveratrol (3,5,4′-trihydroxylstilbene), a phytoalexin in response to injury or fungal attack, is found in grapes and other food products. It has been well documented that the compound has beneficial effects as hypolipidemic, anticancer, antiviral, neuro
- Jiang, Haipeng,Fang, Hanjun,Jiang, Ling,Zheng, Limin,Wang, Nian,Zheng, Anmin,Deng, Feng,Liu, Maili
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experimental part
p. 2281 - 2286
(2011/10/12)
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- USE OF HYDROXYSTILBENES FOR DYEING, READY-TO-USE COMPOSITION CONTAINING THEM AND DYEING PROCESS
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The invention relates to the use of hydroxystilbenes for dyeing, to ready-to-use dye compositions comprising them, to a dyeing process using them and to a multi-compartment device containing the compositions used in the processes of the invention.
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