Chapter 2, Problem 65P

Interpretation Introduction

Interpretation: The kind of Newman projection of the conformer of butane shown in below structural representation should be identified.

  

Concept introduction: Various interconvertible forms that results from rotation around the $\text{C–C}$ bind in ethane are termed as conformer. To depict such conformation Newman projections are written. These are obtained by conversion of hashed-wedged line structure simply when molecule is viewed in a plane along the $\text{C–C}$ as illustrated below.

  

Thus in Newman's projection of simple ethane molecule, the “front” $\text{C}$ is depicted as intersection of three bonds with three attached $\text{H}$ . The other three bonds connected to the large circle corresponding to “back” carbon in $\text{C–C}$ bond.