Click the structures and reaction arrows in sequence to view the 3D models and animations respectively
Diels-Alder reactions occur between a conjugated diene and a dieneophile (an alkene). This reaction shows a simple diene combining with a unsaturated aldehyde, which acts as the dineophile. Notice how the diene has to rotate into an unfavorable s-cis coplanar conformation for the reaction to proceed.
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