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SAFETY: Methyl salicylate is an irritant.
Methyl salicylate is used in low concentrations as wintergreen flavor, and as an analgesic too!
Predict the IR spectrum of methyl salicylate
Predict the IR spectrum of methyl salicylate
1. Make a list of each functional group in methyl salicylate
For every double bond, indicate whether it's conjugated or saturated
2. Go to the IR Table of Values (keep this open in a separate tab)
Find each functional group, corresponding bonds, and expected wavenumber ranges.
Include notes about peak shape: broad, strong, medium, weak
The substitution pattern of the benzene ring matters!
Notice the C-H bend region is large, go to Table 2 of the reference table to get a closer approximation of bending frequency based on substitution pattern of the benzene ring
Enter this information into a table, format below.
Interpret the literature IR spectrum of methyl salicylate:
Interpret the literature IR spectrum of methyl salicylate:
Follow the "expected wavenumber range" in your table, look for a signal that corresponds to each.
Enter the corresponding wavenumber from the spectrum below in the literature column of the methyl salicylate table
Some signals may not be labeled and some signals may overlap with others
It is not necessary to assign every signal indicated in the spectrum to a bond
Literature IR
Literature IR
MS.mp4Preparing the sample
Preparing the sample
Interpret the observed IR spectrum of methyl salicylate:
Interpret the observed IR spectrum of methyl salicylate:
Follow the "expected wavenumber range" in your table, look for a signal that corresponds to each
Enter the corresponding wavenumber from the spectrum below in the observed column of the methyl salicylate table
Some signals may not be labeled and some signals may overlap with others
It is not necessary to assign every signal indicated in the spectrum to a bond
MS_IR.mp4Measuring the IR spectrum
Measuring the IR spectrum
Observed IR
Observed IR
Common mistake: labeling all peaks with the computer software.
Click the button on the right to see what not to do before analyzing carvone and aspirin.
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