Chapter 3, Problem 53DSP

Interpretation Introduction

Interpretation:

The dihedral angles in the $\text{β-pyranose}$ form of D-ribose are to be identified.

Concept introduction:

In the chair form of cyclohexane, when two substituents on adjacent carbon atoms are both axial, the dihedral angle between them is $\text{180°}$. They are anti to each other.

When a substituent on one carbon atom is axial and the substituent on adjacent carbon atoms is equatorial, the dihedral angle between them is $\text{60°}$. They are gauche.

When two substituents on adjacent carbon atoms are both equatorial, the dihedral angle between them is $\text{60°}$. They are gauche.