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Chapter 13: Q13-19P (page 413)

Classify the resonances in the13C NMR spectrum of methyl propanoate,CH3CH2CO2CH3.

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NMR Spectra

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01

13C NMR spectroscopy

Most 13C resonances are between 0 and 220 ppm downfield from the TMS reference line, with the exact chemical shift of each 13C resonance dependent on that carbon鈥檚 electronic environment within the molecule.

Generally, the chemical shift is affected by the electronegativity of a nearby atom like oxygen, nitrogen, halogen, etc.

02

13C NMR spectrum for methyl propanoate

The chemical shift value for the carbonyl carbon of ester is 174.9 ppm. While the -CH3group which is attached to the oxygen has a chemical shift value of 51.5 ppm. Also, the -CH3group which is attached to -CH2group is about 9.2 ppm. The -CH2group which is connected to carbonyl carbon has a chemical shift value of 27.5 ppm.

NMR Spectra

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Most popular questions from this chapter

Is a nucleus that absorbs at 6.50 未more shielded or less shielded than a nucleus that absorbs at 3.20 未? Does the nucleus that absorbs at 6.5 未require a stronger applied field or a weaker applied field to come into resonance than the one that absorbs at 3.20 未?

Assign as many resonances as you can to specific carbon atoms in the 13C

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