Chapter 4, Problem 2LGP

Interpretation Introduction

Interpretation:

Using Newman projection, the relative positions of the substituents on the bridgehead atoms of cis- and trans- decalin is to be depicted and the isomer which is more stable is to be determined and the reason for the same is to be explained..

Concept introduction:

Newman projected two types of spatial arrangements of molecules which are staggered and eclipsed Newman projections.

Staggered conformation: It is the arrangement of atoms or groups of atoms in a molecule resulting in a ${60}^{\circ }$ dihedral angle. It is also called anti-coplanar transition. It has low potential energy because of less torsional strain and hence, is more stable

Eclipsed conformation: It is the arrangement of atoms or groups of atoms in a molecule resulting in a $0^{\circ }$ dihedral angle. It is also called syn-planar transition. It has high potential energy because of high torsional strain and hence, is less stable.