Importance of β phenyl group in ipso substitution of arylvinyl cations

Intramolecular and intermolecular ipso substitutions of arylvinyl cations, i.e., α-[p-(2-hydroxyethoxy)phenyl]vinyl cations and α-(p-methoxyphenyl)vinyl cations, were studied with respect to the effect of the β substituent and phenyl group as the β substituent was found to exert a significant influence on the ipso substitution.