Chemistry of Heterocyclic Compounds p. 300 - 303 (1983)
Update date:2022-08-10
Topics:
Filippova, T. A.
Sukhoroslova, M. M.
Lopatinskii, V. P.
Filimonov, V. D.
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 ?0R constant of the 9-carbazolyl group was also calculated.The enthalpy and entropy of acidic dissociation were calculated from data on the effect of 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.
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