Chapter 16, Problem 16.50P

Interpretation Introduction

Interpretation:

The $\text{H}$ NMR chemical shift for the protons on C2 in the given compound is to be estimated.

Concept introduction:

The proton in ${\text{CH}}_2$ group next to a carbonyl carbon has a chemical shift of 2.1 ppm. The proton in alkane ${\text{CH}}_{\text{3}}$ group has chemical shift of 0.9 ppm. If there are two carbonyl groups next to the ${\text{CH}}_2$, the effect is additive.