%0 Journal Article %A Coxon, JM %A Steel, PJ %T A Study of Cations Derived from exo-2-Aryl-1,3,3- and exo-2-Aryl-1,5,5-trimethylbicyclo[2,2,1] heptan-endo-2-ols %J Australian Journal of Chemistry %D 1979/11/01 %V 32 %N 11 %P 2441-2453 %K %R https://doi.org/10.1071/CH9792441 %U https://www.publish.csiro.au/paper/CH9792441 %X The reactions of exo-2-aryl-1,3,3- and exo-2-aryl-1,5,5-trimethylbicyclo[2,2,1]heptan-endo-2-ols in strong acid are reported. The equilibration of 2-(4'-methoxyphenyl)-3,3,endo-6-trimethylbicyclo- [2,2,1]hept-2-yl cation and the exo-6-methyl isomer both formed from 2-(4'-methoxyphenyl)-1,3,3- trimethylbicyclo[2,2,1]hept-2-yl cation is considered to occur by an elimination-addition mechanism. At higher temperatures the bicyclic skeleton collapses to give monocyclic allylic cations. The 13C N.M.R. spectra of these ions are reported.