Understanding E/Z Isomers and Cis-Trans Isomers

This set of flashcards covers the concepts of E/Z isomers, cis-trans isomers, their definitions, properties, and nomenclature, based on the provided lecture notes.

Cis Isomer

An isomer where the substituents are on the same side of the double bond or ring.

Trans Isomer

An isomer where the substituents are on opposite sides of the double bond or ring.

E Isomer

In the E isomer, the highest priority substituents are on opposite sides of the double bond.

Z Isomer

In the Z isomer, the highest priority substituents are on the same side of the double bond.

Cis-Trans Isomers

Isomers that differ in the arrangement of groups around a double bond or ring system.

Physical Properties of Isomers

Cis and trans isomers have different physical properties, such as boiling points and dipole moments.

Cis Isomer Boiling Point Example

Cis isomer has a boiling point (bp) of 99.3 °C.

Trans Isomer Boiling Point Example

Trans isomer has a boiling point (bp) of 91.8 °C.

Diastereomers

E and Z isomers are classified as diastereomers, which are stereoisomers that are not mirror images.

Priority in E/Z Nomenclature

Priority is assigned based on the atomic number of atoms directly attached to the double bond.