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Three-Dimensional Representations

Assigning Priorities

Determining Stereochemical Relationships

Question Sets

A project of the Chemical Education Digital Library
Assigning Priorities: Stereocenters

Priority rules can also be used to determine the spatial orientation of groups around a stereocenter. In order to determine this spatial orientation, a series of steps should be followed.

Step 1: Find all of the stereocenters in a molecule. Recall that a stereocenter is an atom bonded to four different groups.

Find the stereocenter(s) in the molecule below.

There is only one stereocenter in the molecule, marked with an asterisk (*).

Step 2: Assign the priority of the groups around each stereocenter, with 1 being the highest priority and 4 being the lowest priority. Recall the priority rules discussed earlier in this section of the tutorial.

Assign the priorities around the stereocenter for the molecule.

Click Next to check your answer and continue on.

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