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Determination of the Hammett constant σp for the thioamide group

J. Gabriel, I. Němec, N. Zimová, and K. Waisser

Department of Analytical Chemistry, Faculty of Natural Sciences, Charles University, CS-128 40 Prague

 

Abstract: The value of the Hammett substituent constant <σp = 0.40 has been obtained for the thioamide group from Potentiometrie determination of the dissociation constants for benzoic acid derivatives. Because of insolubility of 4-thiocarbamoylbenzoic acid in water, the series of pKa measurements on seven derivatives of benzoic acid had to be carried out in diluted methanol and the ap value was obtained from the pKa(50 % CH3OH, 25 °C) vs. ap dependence.

Full paper in Portable Document Format: 433a389.pdf

 

Chemical Papers 43 (3) 389–393 (1989)

Monday, November 23, 2020

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