7-13CNMRChemicalShiftPhenylethylamineF07

7-13CNMRChemicalShiftPhenylethylamineF07 - 13 C NMR...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

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...
View Full Document

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.

Page1 / 4

7-13CNMRChemicalShiftPhenylethylamineF07 - 13 C NMR...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online