1,4-Dimethylcyclohexa-1,3-diene reacts with (4-BrC6H4)3N˙+SbCl6– by a mechanism involving both proton and electron hole catalysis to give the product of the cyclo-addition between the parent diene and 2,5-dimethylcyclohexa-1,3-diene acting as the dienophile; the persistent e.s.r. spectrum of the adduct can be observed.
A. G. Davies, R. S. Hay-Motherwell, J. C. Evans and C. C. Rowlands, J. Chem. Soc., Chem. Commun., 1986, 1513 DOI: 10.1039/C39860001513
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