Explore BrainMass

1H NMR Spectrum Interpretation

I need to: provide an interpretation for all protons in the 1H NMR spectrum of 4-vinylbenzoic acid and indicate how the 1H NMR spectrum of the corresponding methyl ester would differ from that of the acid.

On the 1H spectrum, I see a quartet around 6.8ppm which I don't know where it comes from, because I think it should be a triplet and also why there is two doublets, when I think there should only be one. I can see that the singlet at 7.2ppm is probably the H of -OH. and the two doublets at around 7.5 and 8.0ppm are Ar-H protons. I also need help on the methyl ester part.


Solution Preview

4-Vinylbenzoic acid is an aromatic carboxyllic acid. There are three distinct groups in this molecule: benzene ring, vinyl group and -COOH group. In all there should be 6 NMR peaks .2 peaks corresponding to Ar-H, 3 peaks due to the vinyl group and one peak due to -COOH group. You are getting exactly what is expected. The peak at ...

Solution Summary

This Solution contains over 200 words to aid you in understanding the Solution to these questions.