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Neighboring general acid participation in thiolester aminolysis in an aprotic solvent

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Abstract

The kinetics of n-butylaminolysis of acyl-substituted phenyl tiolbenzoates in acetonitrile at 25°C was studied. From the second order rate constants a Hammett rho value of 1.45 was obtained. The results indicate a proinounced neighboring group effect in the reaction of phenyl thiolsalicylate, providing the first kinetic evidence for intramolecular general acid participation by a hydroxy function in an aprotic solvent.

Abstract

Была исследована кинетика н-бутиламинолиза ацилзамещенных фенил-тиолбензоатов в ацетонитриле при 25 °C. Исходя из констант скоростей второго порядка, длк величины ρ в уравнении Гаммета было получено значение 1,45. Результаты указывают на значительный эффект соседних групп в реакции фенил-тиолсалицилата, давая первое кинетическое доказательство интрамолекулярного участия гидроксильной группы в образовании кислоты в апротонных средах.

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Kőmives, T., Márton, A.F., Holly, S. et al. Neighboring general acid participation in thiolester aminolysis in an aprotic solvent. React Kinet Catal Lett 8, 19–24 (1978). https://doi.org/10.1007/BF02070341

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  • DOI: https://doi.org/10.1007/BF02070341

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