Chapter 16, Problem 16.53P

Interpretation Introduction

Interpretation:

Two signals appear in the ${}^{\text{1}}\text{H}$ NMR spectrum of the given compound. One has twice the integration of the other. Why the signal with greater area corresponds to a chemical shift of $\text{9}\text{.3 ppm}$ and the signal with less area corresponds to a chemical shift of $\text{-2}\text{.9 ppm}$ is to be explained.

Concept introduction:

Chemical shift is a measure of a signal’s frequency relative to the signal frequency generated by tetramethylsilane (TMS). The integration of an NMR signal is the area under the peaks in the spectrum and is graphically represented as an integral trace. In a ${}^{\text{1}}\text{H}$ NMR spectrum, integration is proportional to the number of protons giving rise to that signal.