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Reaction of 1,4-dimethyl but-2-ynedioate and cyclohexa-1,3-diene Predict the major product formed when the compounds shown below react with each other under the influence of heat.
Accepted Answer
The major product formed in the reaction of 1,4-dimethyl but-2-ynedioate (dimethyl acetylenedicarboxylate) with cyclohexa-1,3-diene under heat is a Diels-Alder adduct. The diene (cyclohexa-1,3-diene) will attack the dienophile (dimethyl acetylenedicarboxylate) in a concerted manner, forming a six-membered ring. The reaction proceeds with syn stereochemistry, meaning that the substituents on the dienophile will end up on the same side of the newly formed ring. The product will be a substituted cyclohexene with two ester groups on the ring.
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