7-13CNMRChemicalShiftPhenylethylamineF07 - 13 C NMR...

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Unformatted text preview: 13 C NMR Continued – Chemical Shift During last week’s experiment we learned that the number of peaks in a 13 C NMR spectra is indicative of the number of unique carbon environments in a molecule. This week we will look at the 13 C NMR spectra of (S)-phenylethylamine to determine the number of unique carbons and introduce chemical shift. Review - Counting the lines. Use what you learned last week to determine which of the following 13 C NMR spectra corresponds to (S)-phenylethylamine. CH 3 C H 2 N H Like infrared spectroscopy, 13 C NMR can also be used to gather functional group information. The chemical shift ( δ ) is the position of the peak in ppm in reference to a standard compound. Tetramethylsilane (Si(CH 3 ) 4 , TMS) is commonly used as a reference and its chemical shift is set at 0 ppm. The chemical shift of a nucleus is determined by the nature of the nearby groups. In general, increasing the electron density around a carbon, often called “shielding” the carbon, will shift the...
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This note was uploaded on 05/13/2010 for the course CHEM 151L taught by Professor Roy,christopher during the Fall '08 term at Duke.

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7-13CNMRChemicalShiftPhenylethylamineF07 - 13 C NMR...

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