Chapter 22, Problem 5Q

Interpretation Introduction

Interpretation:

The structural formula of $\beta -\text{pyranose}$ form of (a) is to be given.

Concept introduction:

The pyranose compound contains six-membered monosaccharide ring, whereas the furanose compound contain five-membered ring.

The cyclic hemiacetal form of glucose differs only in the configuration of the hydroxyl group at C-1 atom.

$\alpha \text{\hspace{0.17em}and\hspace{0.17em}}\beta$ designations are given to anomers depending on the location of the $-\text{OH}$ $\text{group\hspace{0.17em}at\hspace{0.17em}C}-\text{1}$ position.

In the $\alpha$ anomer, the hemiacetal hydroxyl group is trans to the ${\text{CH}}_{\text{2}}\text{OH}$ group, whereas in $\beta$ anomer, the hemiacetal hydroxyl group is cis to the ${\text{CH}}_{\text{2}}\text{OH}$ group.