Question
Please assign structural labels for the following NMR reading. Given the expected result was 4-vinylbenzoic acid, identify the structural elements and the impurities shown in the NMR. Also show the J-coulling values for the produced.

Sample 32 7.522 2.01 7.5 7.498 -7.267 -6.831 -6.794 6,772 -6.737 -5.939 --5.879 - 5.447 -5.411 ppm
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Answer #1

H4 HT III Hoo 1H NMR (considering instrument frequency of 300 MHz) H1 = 8.07 (d, J=6.9 Hz, 2H) H2 = 7.5 (d, J=6.9 Hz, 2H) H3

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