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- W2125890998 abstract "Addition of substituted benzenesulfunic acids to p-benzoquinone-h4 and -d4 has been studied kinetically in aqueous solutions at pH below 6. The rate is expressed as v = k[[quinone] × [sulfinate ion] and the second-order rate constant k satisfies the Hammett's equation, giving ϱ values of −1·59, −1·55, and −1·64 at pH 1·90, 3·50, and 4·82, respectively. The significant isotope effect is observed at pH 4·82, kH/kD being ca. 1·5–1·8, but no kinetic isotope effect for the reaction at pH below 3·50. These results indicate that the rate-determining step shifts from the addition step to the deprotonation step with increasing pH, and that the substituents hardly influence the deprotonation step. The Hammett's ϱ-value for the ionization of benzensulfinic acids was ca. 1·07." @default.
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- W2125890998 title "Kinetics of the addition of substituted benzenesulfinic acids to p-benzoquinone" @default.
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- W2125890998 doi "https://doi.org/10.1016/s0040-4020(01)97868-8" @default.
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