Abstract: The reactivities of 1-cyano-1-ethoxyethene (1) and 1-(trifluoromethy1)-1- ethoxypentene (2) in aqueous H2S04 and D2S04 have been measured. The kinetics and products establish the mechanism of these reactions as rate-limiting protonation on the double bond. The observed rates are predicted with surprising accuracy by the previously introduced correlation log kH+=-10.5~ 0~'-8.92.
