The 1H NMR spectrum of CH3OH recorded on a 500 MHz NMR spectrometer consists of two signals, one due to the CH3 protons at 1715 Hz and one due to the OH proton at 1830 Hz, both measured downeld from TMS. (a) Calculate the chemical shift of each absorption. (b) Do the CH3 protons absorb upeld or downeld from the OH proton?

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Asked Dec 29, 2019
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The 1H NMR spectrum of CH3OH recorded on a 500 MHz NMR spectrometer consists of two signals, one due to the CH3 protons at 1715 Hz and one due to the OH proton at 1830 Hz, both measured downeld from TMS. (a) Calculate the chemical shift of each absorption. (b) Do the CH3 protons absorb upeld or downeld from the OH proton?

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Expert Answer

Step 1

The 1H NMR spectrum of CH3OH recorded on a 500 MHz NMR spectrometer consists of two signals, one due to the CH3 protons at 1715 Hz and one due to the OH proton at 1830 Hz, both measured downfield from TMS.

 (a) The chemical shift of each absorption is to be calculated.

(b) Whether the CH3 protons absorb upfield or downfield from the OH proton is to be explained.

Step 2

Proton nuclear magnetic resonance (1H NMR) is used to identify the hydrogen atoms in a different environment and the size of the peak gives information about the number of hydrogen atoms in each environment.

The NMR spectrum is a plot of the applied radio frequency versus the absorption. The applied frequency increases from left to right.

Hence, the left side of the plot is the downfield and the right side of the plot is the upfield.

Chemistry homework question answer, step 2, image 1
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Step 3

The position of absorption on the scale is called che...

Chemistry homework question answer, step 3, image 1
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