Chapter 22, Problem 41P

Interpretation Introduction

Interpretation:

The number of acetonide groups present in the given compound based on the ${}^{13}\text{C NMR}$ spectrum is to be determined.

Concept introduction:

The acetonides are a group of cyclic acetals that act as a protective group for vicinal-cis $\text{-OH}$ groups of carbohydrates. It can be removed by the hydrolysis of ketal.

The ${}^{13}\text{C NMR}$ or the carbon-13 nuclear magnetic resonance is an analytical technique in chemistry to know the carbon atoms in the structure of a compound. It is an important tool in structure elucidation of organic compounds. It can detect the only ${\text{C}}^{13}$ isotopes and not ${\text{C}}^{12}$ as the latter has zero net spins.