Abstract: Vinyl solvolyses are somewhat anomalous when compared with the behavior of saturated analogs. There is evidence of nucleophilic solvent involvement of alkyl-substituted vinyl substrates (m and l values are of intermediate magnitude and the effect of changes in solvent nucleophilicity at constant ionizing power is significant), but, in contrast, the carbonium ion character is high (p* is large for alkyl substitution) and added strong ...