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Three-Dimensional Representations

Assigning Priorities

Determining Stereochemical Relationships

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Definitions: Stereoisomers

Stereoisomers are compounds that have the same molecular formula, same connectivity, and different spatial arrangements (orientations).

In the previous section, it was determined that these compounds were constitutional isomers. Notice that, by definition, constitutional isomers cannot be stereoisomers and vice versa. (Recall that constitutional isomers must have different connectivities, while stereoisomers must have the same connectivity.) Therefore, these molecules are not stereoisomers.

There are two major types of stereoisomers, conformational isomers and configurational isomers.

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