What are Sawhorse projections in organic chemistry?
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.
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.