The endocyclic double bond of 4-vinylcyclohexene can act as dienophile towards cyclopentadiene at 240°. 4-Vinyltricyclo[6,2,1,0]undec-9-ene (II)(ca. 5%) is formed together with the known 5-cyclohex-3-enyl-bicyclo[2,2,1]hept-2-ene (I).
S. R. Wallis, J. Chem. Soc., Perkin Trans. 1, 1972, 1647 DOI: 10.1039/P19720001647
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