Analyze where the main points are and are the peaks downfield or up O ppm5 ppm10 ppmFigure 6: Experimental Data: Spectroscopic Data H-NMR of Product in d-chloroform

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Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Analyze where the main points are and are the peaks downfield or up

O ppm
5 ppm
10 ppm
Figure 6: Experimental Data: Spectroscopic Data H-NMR of Product in d-chloroform

Expert Solution

Step 1

It is often convienient to describe the relative positions of the resonances in an NMR spectrum. For example, a peak at a chemical shift, δ, of 10 ppm is said to be downfield or deshielded with respect to a peak at 5 ppm, or if you prefer, the peak at 5 ppm is upfield or shielded with respect to the peak at 10 ppm.

The terms “upfield” and “downfield” describe the relative location of peaks. Upfield means to the right. Downfield means to the left. peak upfield from typical NMR absorptions.

Because the proton experiences higher external magnetic field, it needs a higher frequency to achieve resonance, and therefore, the chemical shift shifts downfield (higher ppms) .

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