Question

How do you draw a Newman projection for hexane while sighting down ${C_2} - {C_3}$ ​?

Answer 1

For the given problem, we first need to figure out the normal structure of hexane which is a straight chain of six carbon atoms with all valances satisfied by the hydrogen atoms. Then figuring out the ${C_2} - {C_3}$ and then fixing them in Newman projection template. After fixing the groups on the template, we have the Newman structure of hexane.

Complete Step By Step Answer:
1. Draw the structure of hexane.

2. Convert the drawn structure from ${C_2}$ and ${C_3}$ to a wedge-dash structure.
3. Identifies the ${C_2}$ and ${C_3}$ groups.
The main chain of hexane is the horizontal zigzag line of carbon atoms. ${C_1}$ is on the left.
The groups of ${C_2}$ are $H,H\& C{H_3}$ . At ${C_3}$ are $H,H,\& C{H_2}C{H_2}C{H_3}$ .
4. Draw the Newman projection template.
5. Attach the group to the carbon in the template.

Shows the numerator from the left. The group of ${C_2}$ is on the previous carbon atom. Place the $C{H_3}$ group at the bottom. The two hydrogen atoms move to the other bond. The group of ${C_3}$ moves to the rear carbon. The bulky $C{H_2}C{H_2}C{H_3}$ group is at the top and two hydrogen atoms are on the other bond.
This is the most stable conformer because it has displaced volumetric methyl and propyl groups.

Note:
The Newman projection, useful in alkane stereochemistry, visualizes the structure of a chemical bond from front to back, with the front atom represented as a point and the rear carbon as a circle. The carbon atom in front is called near, while the atom behind is called far.