How is it possible to tell which product above is formed?
The regioselectivity of the reaction can be determined by working out where the largest coefficient of the HOMO lies in the diene and the largest coefficient of the LUMO lies in the dienophile. The reagents come together in the orientation where these ‘largest’ coefficients can overlap.
Combining the two ends gives the product that is formed.
To see this reaction in 3D click here.
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