The kinetics and mechanism of hydrolysis of N-hydroxyphthalimide in the presence of various buffers (dichloroacetic acid, chloroacetic acid, glycine, sodium formate, sodium acetate, N-(2-morpholinoethane)sulfonic acid, and tris(hydroxymethyl)aminomethane) were studied at 50 A degrees C and an ionic strength of 1.0 M. The second-order rate constants k (b) for the buffer-catalyzed hydrolysis of N-hydroxyphthalimide were found to conform to the Bronsted equation logk (b) = C + beta pK (a). A plot of pK (a) versus k (b) for the data obtained in the buffers and H2O (covering a pK (a) range of -1.74 to 8.33) was constructed, and the data were fitted with a straight line that had a slope (beta) of 0.29 +/- A 0.05 and an intercept (C) of -5.19 +/- A 0.20.
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Univ Michigan, Dept Chem Engn, Ann Arbor, MI 48109 USA
E China Normal Univ, Dept Chem, Shanghai 200062, Peoples R ChinaUniv Michigan, Dept Chem Engn, Ann Arbor, MI 48109 USA
Duan, Peigao
Dai, Liyi
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E China Normal Univ, Dept Chem, Shanghai 200062, Peoples R ChinaUniv Michigan, Dept Chem Engn, Ann Arbor, MI 48109 USA
Dai, Liyi
Savage, Phillip E.
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Univ Michigan, Dept Chem Engn, Ann Arbor, MI 48109 USAUniv Michigan, Dept Chem Engn, Ann Arbor, MI 48109 USA