e-z nomenclature

Question

E-Z nomenclature is used for:

RankGuru · Accepted Answer

The **E-Z system** is the most comprehensive method for naming **Geometrical Isomers** (restricted rotation around $C=C$).
- It is used especially when all four groups attached to the double bond are different, making 'cis-trans' labels unhelpful.
- Based on **CIP (Cahn-Ingold-Prelog) Priority Rules**:
- **$Z$ (Zusammen)**: Higher priority groups on the same side.
- **$E$ (Entgegen)**: Higher priority groups on opposite sides.

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e-z nomenclature

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