Where would you expect to find the 1H NMR signal of (CH3)2Mg relative to the TMS signal? (Hint: Magnesium is less electronegative than silicon.)

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04-03-2020
Chemistry

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Where would you expect to find the 1H NMR signal of (CH3)2Mg relative to the TMS signal? (Hint: Magnesium is less electronegative than silicon.)

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bhuvna789456 bhuvna789456 · Answer 1 · 2020-03-12T07:41:10+01:00

The methyl protons of (CH3)2Mg are in a more electron rich environment than the methyl protons of TMS. Thus the protons of (CH3)2Mg show a signal upfield from TMS.

Explanation:

Mg is less electronegative than Si. The methyl protons of (CH3)2Mg are in a more electron-rich environment than the methyl protons of TMS.

This electron density shields the protons of (CH3)2Mg from the applied magnetic field. Therefore, they sense a smaller effective magnetic field than TMS. The effective magnetic field is directly proportional to the frequency.

Thus the protons of (CH3)2Mg show a signal at a lower frequency than TMS. In other words, protons of (CH3)2Mg show signal upfield from TMS.

andromache andromache · Answer 2 · 2022-03-24T14:46:53+01:00

The methyl protons of (CH3)2Mg should consider a more electron-rich environment as compared to the methyl protons of TMS.

What is (CH3)2Mg ?

Here Mg should be less electronegative as compared to Si. The methyl protons of (CH3)2Mg should be in more electron-rich environment as compared to the methyl protons of TMS. The density of the electron shielded the protons (CH3)2Mg from the applied magnetic field. Also, The effective magnetic field should be directly proportional to the frequency.

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