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- W2054579040 abstract "Acid and base catalysed hydrolysis rates were determined for the ethyl esters of 2- and 3-furoic acids and 2- and 3-thiophenecarboxylic acids. From the data, σ* values were derived for the 2- and 3-furyl- and -thienyl grpups. The dissociation constants (pKa) of the acids are proportional to the σ* values of the appropriate groups and it appeared that benzoic acid fits the same relation. From a study of the hydrolysis of 5-substituted 2-thiophenecarboxylic esters (methyl, chloro, bromo and nitro substituents were covered) it was found, that the alkaline hydrolysis rates could adequately be related by a set of substituent constants σth, which are rather similar to σm in the benzene series. However, both the acidic hydrolysis rates of the same esters, and the chemical shifts of the methyl protons of 5-substituted 2-methylthiophenes show large deviations from this relation." @default.
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- W2054579040 date "2010-09-02" @default.
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- W2054579040 title "Hammett and Taft-Ingold relations in heterocyclic compounds" @default.
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- W2054579040 doi "https://doi.org/10.1002/recl.19650840909" @default.
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