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Three-Dimensional Representations

Assigning Priorities

Determining Stereochemical Relationships

Question Sets

A project of the Chemical Education Digital Library
Assigning Priorities: Double Bonds

The second category for double bonds is used when one carbon on the double bond has different groups from the other carbon on the double bond. All four groups on the double bond do not have to be different, but there must be at least three different groups. This is shown pictorially below.

The structure on the left has two different groups on each carbon. The carbon on the left of the double bond has a propyl group and a hydrogen, and the carbon on the right of the double bond has an ethyl group and a hydrogen. Overall, there are three different groups on the double bond. Notice that the same holds for the structure on the right.

Assign priorities to the groups in both the structure on the left and the structure on the right.

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