Search results
Results from the WOW.Com Content Network
meso-Stilbene dibromide is an organic compound with a formula of (C 6 H 5 CH(Br)) 2. [3] It is one of three isomeric stilbene dibromides, the others being the pair of enantiomers . All are white solids.
Bromination of trans-stilbene produces predominantly meso-1,2-dibromo-1,2-diphenylethane (sometimes called meso-stilbene dibromide), in line with a mechanism involving a cyclic bromonium ion intermediate of a typical electrophilic bromine addition reaction; [21] cis-stilbene yields a racemic mixture of the two enantiomers of 1,2-dibromo-1,2 ...
Resveratrol is a biologically important stilbenoid.. Stilbenoids are hydroxylated derivatives of stilbene.They have a C 6 –C 2 –C 6 structure. In biochemical terms, they belong to the family of phenylpropanoids and share most of their biosynthesis pathway with chalcones.
Stilbene may refer to one of the two stereoisomers of 1,2-diphenylethene: -Stilbene (trans isomer) -Stilbene (cis isomer) See also. Stilbenoids, a class of ...
In E-Z isomerization, the thermal equilibrium lies well towards the trans-form because of its lower energy (~15 kJ mol −1 in stilbene). [3] The activation energy for thermal E-Z isomerization is 150–190 kJ mol −1 for stilbene, meaning that temperatures above 200°C are required to isomerize stilbene at a reasonable rate, but most ...
A meso compound or meso isomer is an optically inactive isomer in a set of stereoisomers, at least two of which are optically active. [1] [2] This means that despite containing two or more stereocenters, the molecule is not chiral. A meso compound is superposable on its mirror image (not to be confused with superimposable, as any two objects ...
Suitably substituted stilbenes may undergo irreversible, rearomatizing elimination or [1,n]-shift processes in the absence of an oxidant. Aryl enynes, [4] heteroatomic stilbene derivatives (e.g. amides [5]), and substrates containing a single heteroatom in place of the stilbene double bond [6] also undergo the reaction.
Maleic acid with a cis-double bond forms the dibromide as a mixture of enantiomers: while the trans-isomer fumaric acid forms a single meso compound: The reaction is even stereospecific in alkenes with two bulky tert-butyl groups in a cis position as in the compound cis-di-tert-butylethylene. [3]