Is Vanillin Formation Likely Based on IR Spectrum Analysis?

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SUMMARY

The discussion centers on the likelihood of vanillin formation based on infrared (IR) spectrum analysis. Participants argue that the IR spectrum indicates the presence of a strong C=O absorption peak at approximately 1740-1720 cm-1, which is significantly stronger in the product spectrum compared to the reagent spectrum of 2-methoxyphenol. This discrepancy contradicts the mark scheme's assertion that vanillin formation is unlikely, as the peaks in both spectra are similar, leading to confusion regarding the interpretation of the IR data.

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  • Understanding of IR spectroscopy and its applications in organic chemistry.
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Homework Statement



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The Attempt at a Solution


so here's what I would say

"Unlikely as the peaks in the IR spec are very similar, no additional peaks have shown"

BUT THE MARK SCHEME SAYS

Vanillin IS likely to have formed;
as the IR spectrum shows absorption for C=O;
at about 1740-1720;
this is ABSENT IN THE IR SPEC of 2-methoxyphenol


BUT IT CLEARLY IS NOT, the PEAK IS CLEARLY THERE IN BOTH SPECTRA
What are they talking about?
 

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C=O peaks are very strong, and the difference between the spectra is that the peak at 1740 is much stronger in the product spectrum than in the reagent spectrum.
 

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