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Oligostilbenes
Oligostilbenoids (oligo- or polystilbenes) are oligomeric forms of stilbenoids. Some molecules are large enough to be considered polyphenols and constitute a class of tannins. Examples Dimers * Ampelopsin A * Epsilon-viniferin * Pallidol * Quadrangularin A Trimers * α-Viniferin * Ampelopsin E * ''trans''-Diptoindonesin B * Gnetin H Tetramers * cajyphenol A * cajyphenol B * Flexuosol A * Hemsleyanol D * Hopeaphenol * Vaticanol B * R2-Viniferin (syn. Vitisin A) Modified * Diptoindonesin C can be isolated from the bark of ''Shorea pinanga'' Other * Diptoindonesin F can be isolated from the bark of ''Shorea gibbosa'' Glycosides * Diptoindonesin A Diptoindonesin A is a C-glucoside of ε-viniferin isolated from the two Dipterocarpaceae '' Shorea seminis'' and ''Dryobalanops aromatica ''Dryobalanops aromatica'', commonly known as Borneo camphor, camphor tree, Malay camphor, or Sumatran cam ... References External links * {{oligostilbenoid ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ampelopsin A
Ampelopsin A is a resveratrol dimer found in ''Ampelopsis glandulosa ''Ampelopsis glandulosa'', with common names creeper, porcelain berry, Amur peppervine, and wild grape, is an ornamental plant, native to temperate areas of Asia including China, Japan, India, Nepal, Myanmar, Vietnam, and the Philippines. It is g ...'' var. ''hancei'' (formerly ''A. brevipedunculata'' var. ''hancei''). References External links (-)-Ampelopsin A, Metabolite Information Resveratrol oligomers Stilbenoid dimers Ampelopsis {{aromatic-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Trans-Diptoindonesin B
''trans''-Diptoindonesin B is an oligomeric stilbenoid. It is a resveratrol trimer. It can be isolated from ''Dryobalanops oblongifolia ''Dryobalanops oblongifolia'' is a species of plant in the family Dipterocarpaceae, native to regions of Southeast Asia and Maritime Southeast Asia. The species name is derived from Latin (' = rather long and leaf (' = leaf); and refers to the s ...''. References Resveratrol oligomers Benzofurans {{Aromatic-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cis-stilbene
(''Z'')-Stilbene is a diarylethene, that is, a hydrocarbon consisting of a cis ethene double bond substituted with a phenyl group on both carbon atoms of the double bond. The name stilbene was derived from the Greek word , which means shining. Isomers Stilbene exists as two possible isomers known as (''E'')-stilbene and (''Z'')-stilbene. (''Z'')-Stilbene is sterically hindered and less stable because the steric interactions force the aromatic rings 43° out-of-plane and prevent conjugation. (''Z'')-Stilbene has a melting point of , while (''E'')-stilbene melts around , illustrating that the two compounds are quite different. Uses * Stilbene is used in manufacture of dyes and optical brighteners, and also as a phosphor and a scintillator. * Stilbene is one of the gain mediums used in dye lasers. Properties * Stilbene will typically have the chemistry of a diarylethene, a conjugated alkene. * Stilbene can undergo photoisomerization under the influence of UV light. * Stilbene ca ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Shorea Gibbosa
''Richetia gibbosa'' (also called yellow meranti) is a large emergent rainforest tree species in the family Dipterocarpaceae. It is native to southeastern Sumatra, Borneo, southern Peninsular Malaysia, and Singapore. The tallest measured specimen is 81.1 metres tall, in the Tawau Hills National Park, in Sabah on the island of Borneo Borneo () is the List of islands by area, third-largest island in the world, with an area of , and population of 23,053,723 (2020 national censuses). Situated at the geographic centre of Maritime Southeast Asia, it is one of the Greater Sunda .... References gibbosa Dipterocarps of Borneo Trees of Peninsular Malaysia Flora of Singapore Trees of Sumatra Critically endangered flora of Asia Taxonomy articles created by Polbot Taxobox binomials not recognized by IUCN {{Dipterocarpaceae-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Shorea Pinanga
''Shorea pinanga'' is a tree in the family Dipterocarpaceae, native to Borneo. The specific epithet ''pinanga'' is derived from a local name for the species. Description ''Shorea pinanga'' grows up to tall, with a trunk diameter of up to . It has buttresses up to tall. The brown to pinkish bark is initially smooth, later becoming cracked and flaky. The leathery leaves are elliptic to ovate and measure up to long. The inflorescences bear pink flowers. Distribution and habitat ''Shorea pinanga'' is endemic to Borneo. Its habitat is mixed dipterocarp forests, to elevations of . Conservation ''Shorea pinanga'' has been assessed as least concern on the IUCN Red List. Although the species population is declining, it is still considered abundant. The species is used for its timber. ''Shorea pinanga'' occurs in a number of protected areas. References pinanga ''Pinanga'' is a genus of flowering plant of the palm family in the subtribe Arecinae. It is native to eastern and s ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
R2-Viniferin
Vitisin A is a resveratrol tetramer found in plants of the genus ''Vitis''. It is a complex of two resveratrol dimers, (+)- epsilon-viniferin and ampelopsin B. It shows an opposite effect to hopeaphenol Hopeaphenol is a stilbenoid. It is a resveratrol tetramer. It has been first isolated from Dipterocarpaceae like '' Shorea ovalis''. It has also been isolated from wines from North Africa. It shows an opposite effect to vitisin A on apoptosis of ... on apoptosis of myocytes isolated from adult rat heart. References External links Website of the Schröder group Resveratrol oligomers Natural phenol tetramers Grape {{aromatic-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Flexuosol A
Flexuosol A is a resveratrol tetramer A tetramer () (''tetra-'', "four" + '' -mer'', "parts") is an oligomer formed from four monomers or subunits. The associated property is called ''tetramery''. An example from inorganic chemistry is titanium methoxide with the empirical formula ... found in '' Vitis flexuosa''. References Resveratrol oligomers Natural phenol tetramers Grape {{aromatic-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
