Irradiation of 4-methyl-4-trichloromethylcyclohexa-2,5-dienone in the presence of cyclopentadiene gives two 1 : 1 adducts whose structures demonstrate the intermediacy of the type A zwitterion and whose stereochemistry shows that the walk rearrangement to the lumiketone proceeds with inversion of configuration.
C. J. Samuel, J. Chem. Soc., Perkin Trans. 2, 1981, 736 DOI: 10.1039/P29810000736
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