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6.2 Ranking the Stability of Newman Projections
Newman projections are a great way to show the different parts of a molecule.
There are two types of conformations, staggered and eclipsed.
There are three different conformations.
Let's draw the three staggered versions of butane.
The first drawing shows the placement of the methyl group at the bottom.
The top left spot is where the methyl group ends up if we rotation the front carbon atom clockwise.
We have one more chance to get the third drawing.
The first drawing can be regenerated by rotating one more time.
There are two drawings with the same groups near each other.
They feel each other and are crowded.
Lying down is the most comfortable position.
Let's take a look at three of the butane's conjugates.
The staggered conformations are low in energy.
The groups are very crowded because they are over each other.
It is very uncomfortable to stand on your head.
The two largest groups are overshadowing each other, so the middle one is the most unstable.
The middle one is the most unstable and all of them are high in energy.
When we look down the bond, we will see the Newman projection.
The front carbon atom is the most stable of all the carbon atoms.
To find the least stable, we need to rotate the front carbon atom.
Draw the most stable and least stable structures for each compound.
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