The specific rates of solvolyis of methyl chloroformate are very well corre
lated by the extended Grunwald-Winstein equation over a wide range of solve
nts; the pathway is believed to be predominantly addition-elimination, exce
pt that a positive deviation for solvolysis in 90% 1,1,1,3,3,3-hexafluoropr
opan-2-ol suggests an 80% contribution from an ionisation mechanism.