SCHEDULED MAINTENANCE
The cycloaddition reactions of o-benzoquinone and 4-chloro-o-benzoquinone with cyclopentadiene, and the reaction of o-benzoquinones with cyclohexa-1,3-diene, are described. The quinones behave as dienophiles yielding 1 : 1 quinone–diene adducts. The cyclopetadiene adducts undergo a novel thermal rearrangement to yield tricyclo[5,2,2,02,6]undeca-3,10-diene-8,9-diones.
W. M. Horspool, J. M. Tedder and Z. ud Din, J. Chem. Soc. C, 1968, 1597 DOI: 10.1039/J39680001597
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