Acidic properties of N-hetarylacetic acids and inductive constants of N-hetaryl substituents

T. A. Filippova, M. M. Sukhoroslova, V. P. Lopatinskii, V. D. Filimonov

Результат исследований: Материалы для журналаСтатья

Аннотация

The inductive constants of the corresponding heterocyclic fragments were calculated on the basis of data on the pKa values obtained by potentiometric titration of derivatives of indole, carbazole, 3-methylcarbazole, tetrahydrocarbazole, 6-methyltetrahydrocarbazole, and phenothiazine. The σR oconstant of the 9-carbazolyl group was also calculated. The enthalpy and entropy of acidic dissociation were calculated from data on the effect of the temperature on the pKa of 9-carbazolylacetic acid. It is shown that the entropy contribution to the free energy of dissociation of 9-carbazolylacetic acid predominates.

Язык оригиналаАнглийский
Страницы (с-по)300-303
Число страниц4
ЖурналChemistry of Heterocyclic Compounds
Том19
Номер выпуска3
DOI
СостояниеОпубликовано - мар 1983

ASJC Scopus subject areas

  • Organic Chemistry

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