Abstract: Using the methods developed previously for generating stable carbonium ions from alcohols in FS08H-SbFsSOz, halides in SbFsSOz, and olefins in FS03H-SbF&02 solution, a series of stable phenylethyl cations were observed. Both classical static phenylethyl cations (like the diphenylethyl, phenyl-ptolylethyl, phenylmethylethyl, diphenylisopropyl, diphenylbenzylcarbonium ions) and equilibrating classical ions (like ...