14357-05-2Relevant articles and documents
Pressure Dependences of Rates of Nucleophilic Attack by Water in Aqueous Solution. Hydrolyses of Methyl p-Nitrobenzenesulfonate and Ethyl Trichloroacetate
Kurz, Joseph L.,Lu, John Y.-W
, p. 1444 - 1448 (1983)
The pressure dependences of the rates of two formally uncatalyzed reactions of water in aqueous solution have been measured in the range 0-2 kbar at 25 deg C.A plot of ln k vs.P for the hydrolysis of ethyl trichloroacetate (water-catalyzed water addition, followed by ethanol elimination) is smoothly and gently curved with ΔV = -33 +/- 3 cm3 mol-1 near P = 0.The corresponding plot for the hydrolysis of methyl p-nitrobenzenesulfonate (direct methyl transfer from ArSO3-1 to H2O) shows an abrupt change in slope near 0.1 kbar, the slope between 0 and 0.07 kbar corresponds to ΔV = -24 +/- 5 cm3 mol-1, while that between 0.14 and 2.07 kbar corresponds to ΔV = -6.3 +/- 0.1 cm3 mol-1.Comparison to the data of Baliga and Whalley for CH3Br hydrolysis at higher temperatures suggests that the pressure dependences of rates of methyl transfer to water may commonly show such changes in slope and that increasing temperature shifts the slope change to higher pressure and decreases its sharpness.