Abstract: The second-order rate constants (km) for reaction of substituted phenoxide ions with 4-nitrophenyl diphenyl phosphate obey a linear equation over a range of 18 substituents with p K~ fi~ values spanning the pK, of the leaving 4-nitrophenolate ion: log kAfi= 0.53 pKmH-6.6. The linear plot is consistent with a mechanism involving a single transition state or a two-step process with a very reactive intermediate with two almost ...
