1 / 18

Using Proton NMR

Using Proton NMR. How many Proton environments?. How many Proton environments?. How many Proton environments?. How many Proton environments?. Proton NMR Spectra. Number of environments = number of peaks Number of protons in environment = relative peak area ( integral)

jameson-sparks
Télécharger la présentation

Using 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. Using Proton NMR

  2. How many Protonenvironments?

  3. How many Protonenvironments?

  4. How many Protonenvironments?

  5. How many Protonenvironments?

  6. Proton NMR Spectra • Number of environments = number of peaks • Number of protons in environment = relative peak area (integral) • Number of protons on neighbouring carbon = splitting pattern (eg. doublet, triplet) • Type of proton environment = chemical shift (compare with datasheet)

  7. Doublet 1H – NMR C2 H4 O Quartet 1 3 Integral

  8. Ethanal 2.2 ppm 9.8 ppm

  9. Quartet 1H – NMR C3H8O Singlet Septet (7) Integral 1 1 6

  10. 1.2ppm 2-propanol 2.2ppm 4.0 ppm

  11. Singlet 1H – NMR C4H8O2 Triplet Quartet Integral 2 3 3

  12. 2.0ppm Ethyl ethanoate 1.3ppm 4.1 ppm

  13. Draw a Proton NMR to represent 1-Bromopropane – label with chemical shift, splitting pattern and relative integration

  14. Draw a Proton NMR to represent 1-Bromopropane

  15. Draw a Proton NMR to represent Butanoic acid – label with chemical shift, splitting pattern and relative integration

  16. Draw a Proton NMR to represent Butanoic acid

  17. Sketch the 1H NMR spectrum of compound X (see right) and label the relative peak areas. Label any peaks that would be lost from the spectrum on shaking with D2O. [4]

  18. 2 proton peak at δ = 3.3-4.3 – singlet (-CH2-) 11 proton peak at δ = 3.5-5.5 – singlet (-OH) 11 proton peak at δ = 11.0-11.7 – singlet (-COOH) 1(ranges of chemical shift (δ) values taken from data sheet)• penalise each error once only• ignore peak areas/heights unless incorrectly labelledLabelled diagram of the structure of G proposed by the student may be used to provide evidence for the positioning of peaks on the sketched spectrum.Both OH and COOH protons disappear on shaking with D2O 1

More Related