An ortho product is formed as a result of the reaction between an electron that is highly concentrated with electron dienes with an electrode that is poorly concentrated with electrode dienophiles. The reaction forms an adduct, which is formed as a result of the combination of the two separate molecules (Dienes and dienophiles)

The reaction results in the formation of bonds and thereby resulting in a diene-dienophiles structure as illustrated below. The creation of a resonance structure is as a result of the favorable reaction that is taking place.

From the reaction, two products are being formed due to the nature of the reaction that is highly stereoselective as well as regioselective. Besides, there is an allowed reaction that is thermally induced where there is an overlap occurring in the uppermost point of the diene and the downside of the dienophile.(Exothermic vs. Endothermic, 2017)

Two new Sigma products are formed from the reaction, namely the endo products and the exoproducts. When both the endo and exoproducts are being formed, the latter is more stable than the endo products. This is because the endo product is being controlled by kinetic energy from the interactions of the secondary orbital. (Exothermic vs. Endothermic, 2017)

Moreover, the endo product that would be formed shall be facing the same side as the Methoxy and the acetyl group which shall be facing upwards. As they shall be facing upwards, they shall also be forming on the forming ring attack that shall be located on the dienophile.  The exo product on the other side shall build on the down and opposite side from the endo. The reaction also occurs the same on the formation ring of the dienophile

In conclusion, the carbonyl group of the exo product might dispatch away from the dienophile, making the endo product more to be formed.

References

Exothermic vs. Endothermic . (2017, March 8). Retrieved from Chemistry: LibreText: https://chem.libretexts.org/Textbook_Maps/Physical_and_Theoretical_Chemistry_Textbook_Maps/Supplemental_Modules_(Physical_and_Theoretical_Chemistry)/Equilibria/Le_Chatelier’s_Principle/Effect_Of_Temperature_On_Equilibrium_Composition/Exothermic_Versus_End

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