Chapter 14, Problem 35P

Interpretation Introduction

Interpretation:

A splitting diagram for vicinal protons in the given molecule is to be constructed and the coupling constants $J_{ab},J_{bc}and{J}_{ac}$ are to be labeled.

Concept introduction:

The size of the vicinal coupling constant between trans protons on a double bond is normally larger than that between cis protons.

For the compounds in which vicinal protons are not equivalent, a proton $H_a$ is coupled to $H_b,H_c,H{d}_{},etc\mathrm{..}$ with unequal coupling constants. The original signal for $H_a$ is split into $(n+1)$ peaks by $n{H}_b$ protons. These lines are further split into $(n+1)$ peaks by $n{H}_c$ protons and each of these lines into $(n+1)$ peaks by $n{H}_d$ protons and so on.