ORGO worksheet 14

ORGO worksheet 14 - 13 C NMR spectroscopy reveals that...

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Problem 14, Chemistry 301X-2006 N,N -dimethylformamide (DMF, 1 ) is flat as a pancake. One hydrogen, the three carbons, the oxygen, and the nitrogen are in the same plane. These atoms are shown in bold in the structure. H 3 C N H 3 C C O H DMF, 1 Make a good orbital drawing of the π system of 1 and explain why this molecule is flat.
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Unformatted text preview: 13 C NMR spectroscopy reveals that there are two different methyl groups when the spectrum is taken at 25 °C. At 111° C, things change and there is only one methyl group. Explain the change in the NMR spectrum with temperature!...
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