Thread: Help with 1H NMR Spectra (Will Choose Best Answer)?
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Unread 11-03-2005, 01:12 PM
Kevin3357 Kevin3357 is offline
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Default Help with 1H NMR Spectra (Will Choose Best Answer)?
IN DMSO (makes a big difference here) So you have an urea derivative. the NH is around 8.5 ppm and then NH2 is around 5.8 ppm. Don't forget we have an electron-withdrawing group - (Phenyl)DMSO can hydrogen bind to the NH groups so that is shifted downfield, why it chooses the NH versus the NH2 is a good question but that is the fact. In CDCL3 I suspect the shift differences would not be as great.

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