A norbornene-type bicyclic alkene + CH₂=CHCOOH --Δ--> ? Product is
(A)A Diels–Alder-type [4+2] cycloaddition adduct is not applicable here (only one alkene, no diene) — instead, this is an ene reaction / direct thermal addition giving a new bicyclic acid with the acrylic acid unit appended across the norbornene double bondCorrect
(B)An unreacted mixture (no reaction without a diene)
(C)A simple 1,2-addition product across the acrylic acid's own double bond only
(D)A polymerized acrylic acid product only
Answer: (A)
Solution
Strained bicyclic alkenes such as norbornene are excellent partners for thermal ene reactions and related pericyclic additions with activated alkenes/dienophiles such as acrylic acid; heating promotes a
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