“…The strong electrondelocalizing ability of the ethoxy and phenyl groups does not lead necessarily to an open transition state, since a bridged sulfonium transition state is observed for these two groups in ArSCl addition 21. However, the values of the + constants of the acetoxy, ethoxy, and phenyl groups (-0.48, -1.10, and -0.29) indicate that the first two groups are best able to stabilize positive charge.…”