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Three-Dimensional Representations

Assigning Priorities

Determining Stereochemical Relationships

Question Sets

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Assigning Priorities: Naming Compounds

All of the spatial orientations - cis, trans, E, Z, R, and S - should be used when naming a molecule. Knowledge of how to name basic molecules is assumed for the purposes of this tutorial.

When using spatial orientations in naming a molecule, the orientation should be written first.

Consider the 2-butene molecules below.

It was determined previously that the molecule on the left has a cis orientation. Therefore, the complete name for this compound is cis-2-butene.

What is the complete name for the molecule on the right?

The molecule on the right has a trans orientation. Therefore, the complete name for the compound on the right is trans-2-butene.

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