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Chapter 26: Problem 107

Draw a Newman projection for the conformation of lowest energy for viewing 2 -methylhexane along the \(\mathrm{C} 2-\mathrm{C} 3\) bond.

Short Answer

Expert verified
The Newman projection of lowest energy for 2-methylhexane along the C2-C3 bond is a staggered conformation with the methyl group and hydrogen atoms evenly distributed around the circle.

Step by step solution

01

Understanding Newman Projections

In a Newman projection, we look at a molecule from one end. The molecule should be visualized such that the bond of interest is along the sight line. The carbon atom in front appears as a dot and the three groups attached are shown radiating out from this center. The carbon atom in the back is represented as a circle and the three attached groups are also shown radiating from the center but in the orientation they appear from the front carbon perspective.
02

Drawing Molecule Structure

Draw the skeletal structure of 2-methylhexane. This contains 7 carbon atoms, a methyl group at the second carbon, and the rest have hydrogen atoms attached. This will help to provide a visual before drawing the Newman projection.
03

Newman Projection

Draw the Newman projection along the C2-C3 bond. The front carbon (C2) of the Newman projection will have the methyl group (CH3) and two hydrogen atoms attached. The back carbon (C3) has three hydrogen atoms attached. The lowest energy conformation, known as the staggered conformation, has the hydrogen atoms and methyl group distributed evenly around the circle, reducing the molecular strain.

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