Chapter 20, Problem 52P

Interpretation Introduction

Interpretation:

The structure of $\text{D-galactose}$ by using arguments similar to those used by Fischer to prove the structure of $\text{D-glucose}$ is to be stated.

Concept Introduction:

Kiliani-Fischer performed a synthesis on the $(-)-\text{arabinose}$ and the two sugars were obtained that are $(+)-\text{glucose}$ and $(+)-\text{mannose}$.  This means that $(+)-\text{glucose}$ and $(+)-\text{mannose}$ are the $\text{C-}2$ epimer.  There are 16 stereoisomers of aldohexose are known which are actually eight pairs of enantiomers.  So, by knowing the structure of one of the set of eight, we can determine the structure of other eight.