Cisalkeenien
Cisalkeenien, or cis alkenes, are alkenes in which the two substituents attached to the carbon atoms of the carbon–carbon double bond occupy the same side of the double bond. This geometry is a form of geometric isomerism arising from restricted rotation about the double bond. The opposite arrangement, where the substituents lie on opposite sides, is called trans alkenes.
In contemporary terminology the cis configuration corresponds to the Z-notation under the Cahn–Ingold–Prelog system, while the
Cis alkenes often differ in physical properties from their trans counterparts due to differences in dipole
Synthesis and separation of cis alkenes rely on selective reactions and stereochemical controls, such as partial
Common examples include cis-2-butene and cis-1,2-dichloroethene; cis configurations also appear in agricultural, pharmaceutical, and polymer-related contexts.