What if there are no double bonds or lone pair donating groups on the dienophile, but instead two alkyl groups? Which alkyl group is assigned endo as nomenclature?
At that point, the primary difference between the groups becomes steric. As a rule, the smaller group goes endo because the endo position is more sterically crowded.
Great visualization
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What if there are no double bonds or lone pair donating groups on the dienophile, but instead two alkyl groups? Which alkyl group is assigned endo as nomenclature?
At that point, the primary difference between the groups becomes steric. As a rule, the smaller group goes endo because the endo position is more sterically crowded.
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