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>Activation parameters and the catalytic effects of poly(3‐alkyl‐1‐vinylimidazolium) salts on the hydrolysis of neutral phenyl esters
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Activation parameters and the catalytic effects of poly(3‐alkyl‐1‐vinylimidazolium) salts on the hydrolysis of neutral phenyl esters
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机译：Activation parameters and the catalytic effects of poly(3‐alkyl‐1‐vinylimidazolium) salts on the hydrolysis of neutral phenyl esters
AbstractAlkaline hydrolyses ofp‐nitrophenyl acetate (PNPA) andp‐nitrophenyl laurate (PNPL) were studied in the presence of poly(3‐methyl‐1‐vinylimidazolium iodide) (PVII‐C1), poly(3‐n‐hexadecyl‐1‐vinylimidazolium iodide) (PVIII‐C16) and their monomeric analogs. The polysoap (PVII‐C16) was a completely quaternized polyion, in contrast to other polysoap systems that have been studied. The hydrolysis of PNPA was not affected by these polyions. The hydrolysis of PNPL was instead enhanced by the addition of these cationic polyions. The magnitudes of the enhancement were in the order of PVII‐C16>PVII‐C1, which is explained in terms of the hydrophobicity of these polyions. Values ofk2, the rate constant of the polymer substrate complex, indicated that the esters bound to the polymer were more reactive than the free esters. Binding or association constants (K) obtained also increased in the order PVII‐C16>PVII‐C1. Inhibitory results were observed for the hydrolysis of PNPL in presence of 3‐n‐hexadecyl‐1‐vinylimidazolium iodide (VII‐C16). The activation parameters f
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