Click the structures and reaction arrows in sequence to view the 3D models and animations respectively
Acylic dienes always react in the s-cis conformation. Butadiene normally prefers to be in the s-trans conformation for steric reasons. However, it must adopt the unfavorable s-cis conformation, by rotating through its middle single bond to achieve a flat planar structure, before it reacts with the dienophile.
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