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Three-Dimensional Representations

Assigning Priorities

Determining Stereochemical Relationships

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Assigning Priorities: Double Bonds

These priority rules can be used to determine the spatial orientation of groups with respect to a double bond or on a stereocenter.

The spatial orientation of groups relative to a double bond can be determined based on whether the first priority groups are on the same or opposite side of the double bond. However, this determination can only be made for internal double bonds. Terminal double bonds, or double bonds on the end of a molecule, have no special orientation.

To see this, assign the priority of the groups attached to both sides of the double bond in the molecule below. (Recall that there should only be priorities 1 and 2 for each carbon of the double bond.)

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