You know what it looks like… but what is it called?
TAKE THE QUIZ“Diels-Alder”
We have one entry that includes the term Diels-Alder.
Diels-Alder reaction
noun: an addition reaction in which a diene unites with the double or triple bond of an unsaturated compound to form a 6-membered ring (as in tetrahydro-phthalic anhydride)
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Merriam-Webster unabridged