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In larger rings (from around 8 atoms), cis-trans isomerism of the double bond may occur.
Diazenes (and the related diphosphenes) can also exhibit cis-trans isomerism.
This property gives rise to cis-trans isomerism.
On the other hand odd numbers of double bonds in a cumulated system with proper substituents show cis-trans isomerism.
An obsolete term for "cis-trans isomerism" is "geometric isomers".
Cis-trans isomerism occurs in octahedral and square planar complexes (but not tetrahedral).
Cis-trans isomerism can also occur in inorganic compounds, most notably in diazenes and coordination compounds.
In addition to identification, the technique has been used to elucidate certain aspects of polymer microstructure, such as branching, crystallinity, tacticity, and cis-trans isomerism.
E and Z refer to the cis-trans isomerism between the enolate oxygen bearing the positive counterion and the highest priority group on the alpha carbon.
The simplest examples of cis-trans isomerism are the 1,2-disubstituted ethenes, like the dichloroethene (CHCl) isomers shown below.
Cis-trans isomerism in polydienes and tacticity variations in certain α-methyl substituted polymers alter chain flexibility and affect T g.
The compounds in this group exhibit cis-trans isomerism, with six isomers that differ by the relative positions of the hydroxyls compared to the mean plane of the ring.
Perfluorodecalin exhibits cis-trans isomerism, as the tertiary fluorines atoms on the bridge carbon atoms can be either on the same side as each other (cis-isomer) or on opposite sides (trans-isomer).
The molecule contains three asymmetric carbon atoms, there is cis-trans isomerism at the cyclopropane ring, and cis-trans isomerism at the carbon-carbon double bond of the alkene.
An estimate of cis-trans isomerism can be made by measuring the absorbance A of each band, where and I o and I are the intensities of the incident and transmitted radiation respectively.
It is stable up to 194 C. The compound exhibits cis-trans isomerism at the central azo group: the trans isomer is more stable and is yellow, while the cis isomer is less stable and is blue.
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