Question

The following "H NMR peaks were recorded on a spectrometer operating at $200 \mathrm{MHz}$. Convert each into $\delta$ units. (a) $\mathrm{CHCl}_{3} ; 1454 \mathrm{~Hz}$ (b) $\mathrm{CH}_{3} \mathrm{Cl} ; 610 \mathrm{~Hz}$ (c) $\mathrm{CH}_{2} \mathrm{OH}$ : $693 \mathrm{H}$ (d) $\mathrm{CH}_{2} \mathrm{Cl}_{2}: 1060 \mathrm{H}_{7}$

Name: Problem 4, Chapter 11: Organic chemistry with biological applications
Uploaded: 2020-07-02T09:05:51-08:00
Duration: 1 min 3 s
Channel: Lottie Adams
Description: The following "H NMR peaks were recorded on a spectrometer operating at 200 MHz. Convert each into δunits. (a) CHCl3 ; 1454 Hz (b) CH3 Cl ; 610 Hz (c) CH2 OH : 693 H (d) CH2 Cl2: 1060 H7

   The following "H NMR peaks were recorded on a spectrometer operating at $200 \mathrm{MHz}$. Convert each into $\delta$ units.
(a) $\mathrm{CHCl}_{3} ; 1454 \mathrm{~Hz}$
(b) $\mathrm{CH}_{3} \mathrm{Cl} ; 610 \mathrm{~Hz}$
(c) $\mathrm{CH}_{2} \mathrm{OH}$ : $693 \mathrm{H}$
(d) $\mathrm{CH}_{2} \mathrm{Cl}_{2}: 1060 \mathrm{H}_{7}$

Organic chemistry with biological applications

John E. McMurry 3rd Edition

Chapter 11, Problem 4

Instant Answer

Solved by Expert Lottie Adams

07/02/2020

Step 1

00727 ppm (b) CH3Cl: δ (ppm) = 610 Hz / 200 MHz = 0.00305 ppm Show more…

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The following "H NMR peaks were recorded on a spectrometer operating at $200 \mathrm{MHz}$. Convert each into $\delta$ units. (a) $\mathrm{CHCl}_{3} ; 1454 \mathrm{~Hz}$ (b) $\mathrm{CH}_{3} \mathrm{Cl} ; 610 \mathrm{~Hz}$ (c) $\mathrm{CH}_{2} \mathrm{OH}$ : $693 \mathrm{H}$ (d) $\mathrm{CH}_{2} \mathrm{Cl}_{2}: 1060 \mathrm{H}_{7}$

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Key Concepts

Conversion from Hz to ppm

The conversion from Hz to ppm is accomplished by dividing the measured frequency difference by the spectrometer operating frequency in MHz. This relation standardizes chemical shift values across instruments of different frequencies, making them comparable.

Spectrometer Frequency

The spectrometer frequency (measured in MHz) is the operating frequency of the NMR instrument. It determines the Larmor frequency of the nuclei and is crucial for converting the measured frequency differences (in Hz) into chemical shift values (in ppm).

Chemical Shift (?)

Chemical shift is a dimensionless quantity in NMR that represents the difference in resonance frequency of a nucleus relative to a standard reference compound, expressed in parts per million (ppm). It provides valuable information about the chemical environment surrounding the nuclei in a molecule.

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