Stilbene


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stilbene

[′stil‚bēn]
(organic chemistry)
C6H5CH:CHC6H5 Colorless crystals soluble in ether and benzene, insoluble in water; melts at 124°C; used to make dyes and bleaches and as phosphors. Also known as diphenylethylene; toluylene.

Stilbene

 

an aliphatic-aromatic hydrocarbon; the trans form of 1,2-diphenylethylene (C6H5—CH═CH—C6H5; the cis form is known as isostilbene). Stilbene is obtained as colorless crystals that are readily soluble in regular organic solvents but insoluble in water. The melting point is 124°C, and the boiling point 306°-307°C. Stilbene crystals are used in scintillation counters, and certain stilbene derivatives are used as pharmaceuticals, for example, diethylstilbesterol, and as optical bleaches and azo dyes.

References in periodicals archive ?
It exists in plants of several families, such as: Cyperaceae, Dipterocarpaceae, Gnetaceae, Fabaceae, Leguminoseae, Pinaceae, Poaceae, and Vitaceae, and is synthesized from the phenylpropanoid substrates that are present in all higher plants and it also involves the activity of stilbene synthase or resveratrol synthase (STS) (Jeandet).
Ortega, "Role of natural stilbenes in the prevention of cancer," Oxidative Medicine and Cellular Longevity, vol.
Yoshikawa, "Antioxidant constituents from rhubarb: structural requirements of stilbenes for the activity and structures of two new anthraquinone glucosides," Bioorganic and Medicinal Chemistry, vol.
Baek, "Production of a major stilbene phytoalexin, resveratrol in peanut (Arachis hypogaea) and peanut products: a mini review," Reviews in Environmental Science and Bio/Technology, vol.
Bolling, "Characterisation of stilbenes in California almonds (Prunus dulcis) by UHPLC-MS," Food Chemistry, vol.
Compounds 5 and 6 had stilbene structures and showed potent inhibitory activity, with [IC.sub.50] values of 6.73 [micro]M and 11.05 [micro]M as compared to the positive control, Trolox, with an [IC.sub.50] value of 16.83 [micro]M.
For example, the 1H-NMR spectrum of 2i exhibits one singlet for the same two olefin protons in 6.5 ppm that is in agreement with (Z)-structure for stilbene. Aromatic protons appeared in the region between 7.3-7.7 ppm with expected pattern for mono substituted benzene.
Pterostilbene and resveratrol are both stilbene compounds and are structurally related.
Solution-Grown Crystals for High-Energy Neutron Detection made of stilbene constitute the best known scintillator material capable of definitively distinguishing neutrons from gamma rays.
The major peak-to-peak mass increments were 133, 227, 297, 315 to 319, 429, and 445 Da, which corresponded to structures (I) resorcinol, (II) stilbene type, (III) fisetinidin, (IV) catechin, (V) fisetinidin-resorcinol, and (VI) catechin-resorcinol repeating units, respectively (Table 1).
Photorhabdus produces a bioactive secondary metabolite called stilbene (ST).
Application of high-speed counter-current chromatography combined with macroporous resin for rapid enrichment and separation of three anthraquinone glycosides and one stilbene glycoside from Rheum tanguticum.