BioNMR - Proton Magnetic Res Spectrum Question?

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jeanettervetr

12-17-2004 04:32 AM

Proton Magnetic Res Spectrum Question?

The proton magnetic resonance spectrum of N,N-dimethylformamide shows two different chemical shifts for the hydrogen atoms on the methyl group. This phenomena is not due to spin-spin coupling.If not, what is it due to?

Gervald F5191

12-17-2004 04:32 AM

Proton Magnetic Res Spectrum Question?

If you work out the resonance hybrids for this molecule, the pi system includes the N atom, which will therefore be planar and not pyramidal. One of the CH3 groups will therefore be a lot nearer the O atom than the other, and will be fixed in that orientation.

ag_iitkgp3342

12-17-2004 06:50 AM

Proton Magnetic Res Spectrum Question?

Shielding.<br />
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