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Chapter 14: Q45P (page 664)

Identify pairs of coupled protons in the compound whose COSY spectrum is shown below:

Short Answer

Expert verified

Protons in 鈥榓鈥� is split by 鈥榗鈥�; and those in 鈥榖鈥� is split by 鈥榙鈥�.

Step by step solution

01

Step-by-Step SolutionStep 1: Draw a triangle showing the signals

The triangle is drawn in the spectrum which helps in easy identification of coupled protons. There is a cross peak in the triangle which tells about the coupled protons.

02

Finding coupled protons from the triangle

There are two points in the triangle, A and B.Point A denotes that protons in 鈥榓鈥� are split by protons in 鈥榗鈥�. Point B denotes that the protons in 鈥榖鈥� are split by protons in 鈥榙鈥�.

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Most popular questions from this chapter

Explain how the following compounds, each with the same molecular formula, could be distinguished by their 1 H NMR spectra.

Describe the proton-coupled 13C NMR spectra for compounds 1, 3, and 5 indicating the relative positions of the signals.

a) For the following compounds which pairs of hydrogen (Ha and Hb) are enantiotopic hydrogens?

b) which pairs are diastereotopic hydrogens?

The 1H NMR spectra of three isomers with molecular formula C4H9Br are shown here. Which isomer produces which spectrum?

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b)

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How can theirH1NMR spectra distinguish the following compounds?
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