cis-trans isomerism

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Related to geometric isomer: Optical isomers

cis-trans isomerism

[′si¦stranz ī′säm·ə‚riz·əm]
(organic chemistry)
A type of geometrical isomerism found in alkenic systems in which it is possible for each of the doubly bonded carbons to carry two different atoms or groups; two similar atoms or groups may be on the same side (cis) or on opposite sides (trans) of a plane bisecting the alkenic carbons and perpendicular to the plane of the alkenic system.
References in periodicals archive ?
The biological activity of geometric isomers of RA is affected by CYP26A1, CYP26B1, and CYP26C1, which are three types of cytochrome P450 enzymes (CYP26) that metabolise polar metabolites, and this is involved in many physiological processes, including energy metabolism, mainly by affecting the metabolic activity of RA in cells to regulate gene expression.
The aspartato complexes were synthesized using asymmetric synthesis via chiral pool syntheses while ion exchange chromatography was used in separating some of the compounds into their geometric isomers. In determining the most active resolving agent, the predominant isomers were further resolved using (+)-cis-dichlorobis(ethylenediamine)cobalt(III) chloride, (+)-bis(glycinato)(1,10-phenanthroline)cobalt(III) chloride, and (+)-tris(1,10-phenanthroline)nickel(II) chloride.
Hydroxycinnamate exists in 3 geometric isomers as shown in Figure 1.
In collaboration with the University of Shizuoka, the Suntory Institute for Bioorganic Research, and NARD Institute, Suntory has confirmed that the two compounds are geometric isomers with the same molecular weight (500) and molecular formula (C28H3004N8).
More familiar to chemists are geometric isomers, in which the same atoms arrange in different spatial patterns, and stereoisomers, in which atoms arrange range in different orientations around an atomic hub.

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