Chapter 4, Problem 4.22YT

Interpretation Introduction

Interpretation:

A molecular modeling kit is to be given to build a model of $\text{trans-1, 3-dimethylcyclohexane}$ so that it looks exactly like the given chair conformation.

Concept introduction:

In the case of disubstituted cyclohexane, the relationship between these two substituents with the ring is explained with the help of a Haworth projection. Since cyclohexane ring undergoes chair flipping with no switching of either substituent from their side, the relationship between these substituents on a cyclohexane ring does not change on flipping, that is, the cis substituents remain cis, and trans remain trans on flipping. In a Haworth projection, the ring is depicted as being planar, and bonds to substituents are drawn perpendicular to that plane in such way that these substituents come in the plane of the ring, and one side of the ring will be either above this plane or below this plane, depending on the rotation around the plane.