Ch_322a_9.09

Ch_322a_9.09 - Proton Counting in the NMR Spectrum The...

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The ratios of the areas under the resonances in 1 H nmr spectra are proportional to the ratios of the numbers of magnetically nonequivalent H in a compound. Example: toluene CH 3 ! 0 1 2 3 4 5 6 7 8 TMS ! 2.34 aryl H ! 7.1 There are two resonances in the 1 H nmr spectrum of toluene. (5 H) (3 H) The areas under the two resonances are measured and recorded on the spectrum. The vertical displacements of the "integrator" measure the areas. The ratio of these displacements should equal the ratio of the numbers of the nonequivalent H: 5 to 3. 5 3 Proton Counting in the NMR Spectrum
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CH 3 CH 3 CH 3 CH 3 CH 3 H 3 C 5:3 2:3 1:3
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Predictions and Observations Based on the above discussions about chemical shift influences and proton counting, we can assign the following "anticipated" spectra to
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This note was uploaded on 07/22/2009 for the course CHEM 322AL taught by Professor Jung during the Summer '07 term at USC.

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Ch_322a_9.09 - Proton Counting in the NMR Spectrum The...

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