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SAFETY: Carvone is an irritant.
IR Table.pdf
Carvone gives spearmint gum its flavor!
Predict the IR spectrum of carvone
Predict the IR spectrum of carvone
1. Make a list of each functional group in carvone
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
There are two different types of alkenes in carvone. List these as separate functional groups.
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 alkene
Enter this information into a table, format below.
Interpret the literature IR spectrum of carvone:
Interpret the literature IR spectrum of carvone:
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 carvone 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
CARVONE.mp4Preparing the sample
Preparing the sample
Interpret the observed IR spectrum of carvone:
Interpret the observed IR spectrum of carvone:
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 carvone 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
CARVONE_IR.mp4Measuring the IR spectrum
Measuring the IR spectrum
Observed IR
Observed IR
Discuss:
Discuss:
What differences and similarities are there in the literature vs. observed spectra?
How does this spectrum exemplify the relationship between bond length and wavenumber (vibrational frequency)?
Common mistakes: not adding enough sample to the NaCl plates.
Click the button on the right to see what not to do before analyzing methyl salicylate and aspirin.
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