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Learn how to determine the E and Z configuration of alkenes based on the priorities of the groups on the double bond. See examples, tricks, and practice problems with answers.
23 Ιαν 2023 · The configuration at the left hand double bond is E; at the right hand double bond it is Z. Thus this compound is (1E,4Z)-1,5-dichloro-1,4-hexadiene.
3 Νοε 2016 · The E/Z system is comprehensive for all alkenes capable of geometric isomerism, including the cis/trans alkene examples above. We often use cis/trans for convenience, but E/Z is the “official”, IUPAC approved way to name alkene stereoisomers].
E–Z configuration, or the E–Z convention, is the IUPAC preferred method of describing the absolute stereochemistry of double bonds in organic chemistry.
The method used for describing alkene stereochemistry is called the E,Z system and employs the same Cahn–Ingold–Prelog sequence rules given in Section 5.6 for specifying the configuration of a chirality center. Let’s briefly review the sequence rules and then see how they’re used to specify double-bond geometry.
In these situations the rigorous IUPAC system for naming alkene isomers, called the E/Z system, is used. The E/Z system analyzes the two substituents attached to each carbon in the double bond and assigns each either a high or low priority.
Summary. (E)- : the higher priority groups are on opposite sides of the double bond. (Z)- : the higher priority groups are on the same side of the double bond. Note: Three possible suggestions for remembering this: E is for "Enemies", which are on opposite sides.
