C2.8 Analytical Techniques NMR spectroscopy C2.8 Analytical Techniques 24 November 2018

1H spectroscopy Sometimes known as proton spectroscopy Very similar to 13C, however this time we are looking at the environment that hydrogen atoms are in. The spectrum shows: The number of proton environments (number of peaks) The types of proton environments (chemical shift) The number of equivalent protons (relative height of peaks)

Identifying Proton Environments

Identifying Proton Environments

Knowledge Check Identify the different proton environments in the following compounds: Ethanol Pentan-1-ol Petan-3-ol Propanal Methyl benzene

Worked Example

Knowledge Check Identify the number of proton environments and identify the chemical shifts in the following molecules Ethane Propane Propanoic acid 2-methylpropanal Given this information draw a possible spectrum for each of these molecules taking care with the height of each peak.

Past Paper Question Try the past paper question which combines all the spectra we have looked at to date. We will mark it in 10 minutes.