1 / 13

Proton NMR

Proton NMR. All 6 hydrogens are equivalent …only make 1-chloropropane. These 2 hydrogens are equivalent …only make 2-chloropropane. 2 sets of equivalent atoms. - 6 from the methyl groups - 2 from the CH 2 group. Proton NMR Spectrum of Ethanol.

kane-brock
Télécharger la présentation

Proton NMR

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Proton NMR

  2. All 6 hydrogens are equivalent …only make 1-chloropropane

  3. These 2 hydrogens are equivalent …only make 2-chloropropane

  4. 2 sets of equivalent atoms - 6 from the methyl groups - 2 from the CH2 group

  5. Proton NMR Spectrum of Ethanol The strength of the absorption is proportional to the number of equivalent H atoms H Number of peaks = Number of proton environments H H H H H

  6. Proton NMR spectra Number of peaks 1 n/a 2 6:4 1 n/a Ratio of strengths of absorption signals

  7. Proton NMR spectra Number of peaks 2 1:3 1 n/a 4 3:2:2:1 Ratio of strengths of absorption signals

  8. Proton NMR spectra Number of peaks 3 6:1:1 1 n/a 2 6:4 Ratio of strengths of absorption signals

  9. Proton NMR spectra Number of peaks 3 9:2:1 2 3:1 3 3:2:1 Ratio of strengths of absorption signals

  10. Chemical shift The chemical shift depends on what other atoms/groups are near the H. The closer the H is to electronegative atoms (e.g. O, Cl), the greater the shift. d = 2.0 - 2.9 d = 3.3 - 4.3 d = 0.7 - 1.6

  11. For each of the following compounds... • • draw the molecule • • predict the number of signals • • predict the relative intensity of each signal • • predict the approximate chemical shift (δ) of each signal • propanoic acid • 2-chloropropane • 2-methylpropene • butanal • 2-methylbutane • methyl propanoate

More Related