Definitions for cis–trans isomerism
cis–·trans iso·merism

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1. cis–trans isomerism

   Cis–trans isomerism, also known as geometric isomerism or configurational isomerism, is a term used in chemistry that concerns the spatial arrangement of atoms within molecules. The prefixes "cis" and "trans" are from Latin: "this side of" and "the other side of", respectively. In the context of chemistry, cis indicates that the functional groups (substituents) are on the same side of some plane, while trans conveys that they are on opposing (transverse) sides. Cis–trans isomers are stereoisomers, that is, pairs of molecules which have the same formula but whose functional groups are in different orientations in three-dimensional space. Cis-trans notation does not always correspond to E–Z isomerism, which is an absolute stereochemical description. In general, cis–trans stereoisomers contain double bonds that do not rotate, or they may contain ring structures, where the rotation of bonds is restricted or prevented. Cis and trans isomers occur both in organic molecules and in inorganic coordination complexes. Cis and trans descriptors are not used for cases of conformational isomerism where the two geometric forms easily interconvert, such as most open-chain single-bonded structures; instead, the terms "syn" and "anti" are used. The term "geometric isomerism" is considered by IUPAC to be an obsolete synonym of "cis–trans isomerism".

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1. Cis–trans isomerism

   In organic chemistry, cis/trans isomerism is a form of stereoisomerism describing the relative orientation of functional groups within a molecule. It is not to be confused with E/Z isomerism which are related absolute stereochemical descriptors, only to be used with alkenes. In general, such isomers contain double bonds, which cannot rotate, but they can also arise from ring structures, wherein the rotation of bonds is greatly restricted. Cis and trans isomers occur both in organic molecules and in inorganic coordination complexes. The terms cis and trans are from Latin, in which cis means "on the same side" and trans means "on the other side" or "across". The term "geometric isomerism" is considered an obsolete synonym of "cis/trans isomerism" by IUPAC. It is sometimes used as a synonym for general stereoisomerism; the correct term for non-optical stereoisomerism is diastereomerism.

How to pronounce cis–trans isomerism?

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Numerology

1. Chaldean Numerology

   The numerical value of cis–trans isomerism in Chaldean Numerology is: 7

2. Pythagorean Numerology

   The numerical value of cis–trans isomerism in Pythagorean Numerology is: 7

References

1. ^ Wikipedia
   https://en.wikipedia.org/wiki/Cis–Trans_Isomerism
2. ^ Wikidata
   https://www.wikidata.org/w/index.php?search=cis–trans isomerism