Chapter 16, Problem 16.57P

Interpretation Introduction

Interpretation:

Whether the given peaks can be generated by one chemically distinct type of proton is to be explained.

Concept introduction:

Each chemically distint proton generates a signal in proton nmr spectroscopy. The signal may be modified, split into a number of lines, by nearby protons. Typically only protons three bonds away produce distinct splitting of the signal of interest. The number of lines, called multiplicity, into which the signal is split, equals $\text{n+1}$, where n is the number of protons three bonds away.

The intensities of the individual lines in such signals are in fixed ratios, given by Pascal’s triangle.