In acetolysis of neophyl p-bromobenzenesulfonate, ionization is exclusively anchimerically assisted, only neighboring phenyl participating. Rates of aryl-assisted ionization of a series of substituted neophyl p-bromobenzenesulfonates have been measured and correlated with the aid of the Hammett pu relation. Omitting the $-Me0 group, log k of acetolysis is approximately linear in u with a slope p of-3.65. The value of log k for the p-Me0 ...
