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What is the correct product of the Diels-Alder reaction between 2-ethoxybuta-1,3-diene and (Z)-acrylaldehyde-3-d?

It keeps mentioning that my regio-selectivity is incorrect. And that I should consider the charge distributions of the diene and dienophile to figure it out correctly, but I honestly have no idea.

screenshot of What is the correct product of the Diels-Alder reaction between 2-ethoxybuta-1,3-diene and (Z)-acrylaldehyde-3-d?

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  • $\begingroup$ You're also likely to get the endo product over the exo product. $\endgroup$ – Zhe Mar 9 at 2:23
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These resonance structures and the polarization shown within explain the regioselectivity (1,4 isomer instead of 1,3) in the product.

enter image description here

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