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Chapter 3: Q.3-3-17P (page 60)

Question: Sight along the C2-C3 bond of 2,3-dimethylbutane, and draw a Newman projection of the most stable conformation.

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01

Newman Projection

The conformation of a particular molecule can be visualized using structures termed Newman projection. The carbon is rotated around a specific bond to produce several conformers in Newman projection.

02

Newman projection of the most stable conformer

The most stable conformer of 2,3-dimethylbutane can be given as shown below.

Stable conformer of 2,3-dimethylbutane

This conformer is the most stable of all the conformers as the two methyl groups in this conformer are situated opposite to each other. So there is no repulsion among the bulky, methyl groups. The above conformation is the staggered conformation of 2,3-dimethylbutane.

This stable conformer is generated due to the rotation of C2 and C3.

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Most popular questions from this chapter

Draw structures that meet the following descriptions (there are many

Possibilities):

(b) Two isomers with the formula C4H8O2

Question: The barrier to rotation about the C-C bond in bromoethane is 15 kJ/mol (3.6 kcal/mol).

(a) What energy value can you assign to an H鈫愨啋Br eclipsing interaction?

(b) Construct a quantitative diagram of potential energy versus bond rotation for bromoethane.

Draw the structures of the following molecules:

(c) Glycerol, C3H8O3, a substance isolated from fat and used in cosmetics;

it has an -OH group on each carbon.

Question: Locate and identify the functional groups in the following molecules.

Give IUPAC names for the following compounds:

(a)The three isomers of C5H12
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