Figure 2.

Observed β_lg for the spontaneous hydrolysis of phosphate dianions: benzoyl phosphates (gray, data from ref (25)); monoaryl phosphates with no ortho substituents (black); monoaryl phosphates with 2-nitro groups (red); monoaryl phosphates with 2-chloro groups (blue). Data from ref (13) at 39 °C except for phenyl phosphate, where the value was extrapolated from measurements at higher temperature, as reported in ref (8)). The green circle is for methyl phosphate in 1 M KOH, where the value was extrapolated from measurements at higher temperature as reported in ref (8). The data used to create this figure are given in Table S1.