What are Sawhorse projections in organic chemistry?

1 Answer
Dec 17, 2014

A sawhorse projection is a view of a molecule down a particular carbon-carbon bond.


Groups connected to both the front and back carbons are drawn using sticks at 120° angles.

A sawhorse projection is similar to a Newman projection, but it shows the carbon-carbon bond that is hidden in a Newman projection.

Just as with Newman projections, you can draw sawhorse projections in eclipsed and staggered conformations.

Below is a sawhorse projection of the gauche conformation of butane.


They are called sawhorse projections because the eclipsed conformation looks like a carpenter's sawhorse.


Sawhorse projections are useful for determining if two molecules are enantiomers or diastereomers.

They make it easier to see if the structures are mirror images or superimposable.

Here are the sawhorse and Newman projections of butan-2-ol.