Chemical Forums
Chemistry Forums for Students => High School Chemistry Forum => Topic started by: Jiozx on April 18, 2022, 08:39:49 AM
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Hi, I have these two NMR spectra I need to interpret. They belong to 3,4-dimethylbenzaldehyde and 3,5-dimethylbenzaldehyde. The first one is the NMR spectra of 3,4-dimethylbenzaldehyde and the second one is the NMR spectra of 3,5-dimethylbenzaldehyde. I have no idea how to interpret these or if my tables are correct.
(https://www.linkpicture.com/q/NMR3-4.png)
(https://www.linkpicture.com/q/table-4.png)
(https://www.linkpicture.com/q/NMR3-5.png)
(https://www.linkpicture.com/q/table-5.png)
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Did you fill out the tables? If so, then you would have to know something (although your multiplicities are off). H-1 NMR signals give several kinds of information:
One, how many sets of equivalent nuclei exist
Two, how many hydrogen atoms are in each set
Three, what the chemical environment of each set is
Four, how many vicinal (neighboring) hydrogen atoms each set has
Something does not look quite right about the top spectrum regarding signals 2 and 4, but it is possible that this was intentional.