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Kinetics and mechanism of the general base-catalyzed hydrolysis of N-hydroxyphthalimide
被引:4
|作者:
Ahmad, W. Hamdah W.
[1
]
Sim, Yoke-Leng
[2
]
Khan, M. Niyaz
[1
]
机构:
[1] Univ Malaya, Fac Sci, Dept Chem, Kuala Lumpur 50603, Malaysia
[2] Tunku Abdul Rahman Univ UTAR, Fac Sci, Dept Chem Sci, Kampar 31900, Perak, Malaysia
来源:
MONATSHEFTE FUR CHEMIE
|
2013年
/
144卷
/
09期
关键词:
Kinetics;
Buffer catalysis;
N-hydroxyphthalimide;
Hydrolysis;
Mechanism;
TRANSITION-STATE;
ESTER HYDROLYSIS;
ENZYME CATALYSIS;
WATER;
EXCHANGE;
PERSPECTIVES;
FORMAMIDE;
MICELLES;
ACID;
D O I:
10.1007/s00706-013-0990-y
中图分类号:
O6 [化学];
学科分类号:
0703 ;
摘要:
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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页码:1299 / 1305
页数:7
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