Understanding 1H NMR Spectra for Ethyl Acrylate: Hot aq. HCl Treatment Effects

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SUMMARY

The discussion centers on the 1H NMR spectra of ethyl acrylate (C5H8O2) and the effects of treatment with hot aqueous HCl. It is established that the signals at δ 1.3 and 4.2 ppm disappear following this treatment. This phenomenon is attributed to the protonation and subsequent elimination of the ethyl group and vinyl protons in ethyl acrylate, leading to changes in the chemical environment of these protons.

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chem_monkey
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I've got the spectra for C5H8O2 (the spectral database confirms that it's ethyl acrylate) and treatment with hot aq. HCL causes the signals in the 1N NMR spectrum at d 1.3 and 4.2 to disappear. Does anyone know why this happens? Thanks!
 
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What do you think the signals at 1.3 and 4.2 correspond to in ethyl acrylate?
 

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