cis-trans isomerism

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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 ?
This could be explained in that the higher reaction temperature promoted cis-trans isomerization to enhance both the trans-1,4 and vinyl--1,2 units at the expense of the cis-1,4 isomer [23, 25], An increase in the reaction temperature also decreased the Mw of the Co/Nd-BR since the higher reaction temperature induced chain transfer, which led to a lower Mw with a broader MWD of the resulting BR [1, 23],
FKBP38 is a unique member of the FKBP family, in that it is membrane-anchored, and has peptidyl-prolyl cis-trans isomerase (PPIase) activity.
The reaction mechanism is similar to other palladium-catalysed cross-coupling reactions and it consists of oxidative addition, cis-trans isomerization, deprotonation (also called alkynylation), and reductive eliminantion steps.
This proposal combines high level electronic structure calculations and state of the art dynamics simulation methods to study the photochemical reactivity of Protonated Schiff Bases, a prototypical cis-trans isomerizing system, relevant for many photo-biological processes.
tularensis peptidyl-propyl cis-trans isomerase gene (GenBank accession no.
It begins with a cis-trans isomerisation taking place at a double bond, a kind of rearrangement -- in an extremely unfavorable position in spatial terms, though, in which large side groups fight for space.
Clinical results in CLA weight loss studies are equivocal, which may be a function of intensity of exercise as well as the amount of active cis-trans isomers being consumed per day.
SlyD is a cytoplasmic peptidyl-prolyl cis-trans isomerase (PPIase) which is harvested from overexpressing strains of E.
However, he says, a lot of the remaining products showed different proportions and included isomers "with various cis-trans configurations.
Analytical methods are available for sequencing comonomer distribution and for micro-structure determination such as cis-trans or 1.
com/reports/c42551) has announced the addition of Cis-trans Isomerization in Biochemistry to their offering.
The spectra changes with different irradiation time and the reverse cis-trans thermal isomerization at different time intervals are shown in Fig.