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Three-Dimensional Representations

Assigning Priorities

Determining Stereochemical Relationships

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Definitions: Examples of Diastereomers

Consider the following pairs of molecules and determine whether or not they are diastereomers. Click on the link below each pair to check your answer.

These molecules are not diastereomers. These molecules are non-superimposable, which can be seen by flipping one of the molecules 180 degrees, as shown below. In one molecule, the alcohol and chlorine are wedged and the methyl is dashed, and in the other molecule, the alcohol and chlorine are dashed and the methyl is wedged. However, these molecules are mirror images of one another. Therefore, these molecules are enantiomers, not diastereomers.

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