![]() ![]() Why is the Diels-Alder so easy, and many seemingly related reactions so hard? Nor do two dienes combine easily upon heating to give eight-membered rings. After all, we’ve seen plenty of examples of things that don’t work two alkenes, for example, don’t combine to form four membered rings upon heating in the way that a diene and a dienophile combine to form a six-membered ring. What we haven’t really covered is why the Diels-Alder actually works. Generally the endo– is favored over the exo.
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