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Three-Dimensional Representations

Assigning Priorities

Determining Stereochemical Relationships

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Three-Dimensional Representations: Sawhorse Projections

Adding more carbons makes Sawhorse Projections slightly more complicated. As with Newman Projections, Sawhorse Projections can be made for butane, such that its eclipsed, gauche, and anti conformations can be seen. (Recall that these three forms of butane are conformational isomers of one another.) Notice that is much easier to determine the number of carbons in the longest chain using Sawhorse Projections than it is for Newman Projections because the carbon-carbon bond between the second and third carbons is drawn out.

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