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The available information about the kinetics of the hydrolysis of phosphate esters in neutral, alkaline, and acidic media is considered and the mechanisms of the hydrolysis of various reactive forms of mono-, di-, and tri-esters are discussed. A systematic account is given of the rate constants, taking into account the type of ester and its reactive form. The bibliography includes 106 references. CONTENTS

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An isokinetic relationship (IKR) with the parameters Tis o = 6145 K and togkis o = 10.622 is valid for nucleophilic substitution reactions at the saturated carbon atom "with the participation of anionic nucleophiles in aqueous solutions. The IKR describes the rate constants of the reactions with different anionic nucleophiles, leaving groups, and substituents at the electrophilic reaction center. Similar reactions with neutral nucleophiles, which follow another mechanism, are described by a separate IKR with Tiso = -1232 K and logk~s o = 16.226. The reactions of haloforms with hydroxide ion, which proceed by a specific mechanism involving the haloform ionization equilibrium followed by a-elimination of the halide ion. are described by yet another IKR with TLs o = --1463 K and Iogkis o = 21.057. Analysis of temperature dependences of physicochemicat parameters of various processes in the liquid, solid, and gas phases (e.g., rate constants of chemical I /(2.303 R~o}: logk -Iogkis o = -Eisol(2.303RT) -I -(2.303RTiso)-t]. (2)where T/K and Tiso/K is the current and isokinetic temperature, respectively. The Tis o and logkis o values are the same for all members of the reaction series, whereas the isokinetie