Abstract
The isokinetic temperature, β, for the aminolysis of phenyl N-phenylcarbamates with aniline in aqueous dioxane increased with water content in a mixed solvent, increased from 256 up to finally 290.
In aqueous dioxane, plots of In k against 1/ε and of specific conductivity vs. wt% of water in the mixed solvents gave straight lines, respectively, with a bend at 83% dioxane.
It would appear from these findings that 1 : 1 adducts of each molecule of dioxane and water are formed up to the point of a bend at 83 wt% dioxane and that further addition of water leads to the production of free water, consequently bringing about greater stability of an ionic intermediate and subsequent increase in the reaction rate.
