Diels-Alder

2,3-Dimethylbutadiene and Acrolein(propenal)

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Sn2

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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.

J. Sauer, Angew. Chemie Int. Ed. English, 1966, 5, 211–230.

 

 

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