EBK ORGANIC CHEMISTRY-PRINT COMPANION (
EBK ORGANIC CHEMISTRY-PRINT COMPANION (
4th Edition
ISBN: 9781119776741
Author: Klein
Publisher: WILEY CONS
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Chapter 4, Problem 56PP
Interpretation Introduction

Interpretation:

The given conformations are needed to be ranked in order of increasing energy.

Concept introduction:

Conformations are arising due to the free rotation of CC bond. These rotations are measured by dihedral angle; it is the angle between two atoms attached to two different carbons of CC rotation in Newman projection.

The most and least energy occupied conformations are eclipsed and staggered, which are having a dihedral of ‘0’ and ‘60’ degree respectively.

Staggered conformation: conformation is said to be staggered when groups (attached to front and back carbons) are not aligned in the same axis.

EBK ORGANIC CHEMISTRY-PRINT COMPANION (, Chapter 4, Problem 56PP , additional homework tip  1

Eclipsed conformation: conformation is said to be eclipsed when groups (attached to front and back carbons) are aligned in the same axis.

EBK ORGANIC CHEMISTRY-PRINT COMPANION (, Chapter 4, Problem 56PP , additional homework tip  2

Because of the high torsional strain between atoms of eclipsed conformations, makes them more energized as compared to staggered conformations.

For eclipsed conformations, Torsional strain and steric interactions of atoms are the energizing factors.

For staggered conformations, anti-interactions and gauche interactions of atoms are the energizing factors.

To rank: the given conformations in order of increasing energy.

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