Different Vinylic Protons

A proton at higher chemical shift values is deshielded so the aromatic protons are obviously less shielded than aliphatic protons. This means that a greater frequency is required to bring them into reso nance eq. Note that all three vinylic protons in methyl acrylate designated above as h a h b and h c are separated from each other by three bonds or less and thus are all spin coupled.

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