# How do you draw a Newman projection for hexane while sighting down C_2-C_3?

Mar 7, 2016

You follow a series of steps.

#### Explanation:

Step 1. Draw the structure of hexane.

Step 2. Convert it to a wedge-dash structure at $\text{C-2}$ and $\text{C-3}$.

Step 3. Identify the groups on $\text{C-2}$ and $\text{C-3}$.

The main chain of hexane is the horizontal zig-zag line of carbon atoms.

$\text{C-1}$ is on the left.

The groups on $\text{C-2}$ are $\text{H}$, $\text{H}$, and ${\text{CH}}_{3}$.

Those on $\text{C-3}$ are $\text{H}$, $\text{H}$, and ${\text{CH"_3"CH"_2"CH}}_{2}$.

Step 4. Draw a template for a Newman projection.

Step 5. Attach the groups to the carbons of your template.

View the molecule from the upper left.

The groups on $\text{C-2}$ go on the front carbon atom. Put the ${\text{CH}}_{3}$ group on the bottom. The two $\text{H}$ atoms go on the other bonds.

The groups on $\text{C-3}$ go on the back carbon. The bulky ${\text{CH"_3"CH"_2"CH}}_{2}$ group goes on the top, and the two $\text{H}$ atoms go on the other bonds.

This is the most stable conformer, because it has the bulky methyl and propyl groups anti to each other.