Summary
1. The pKa values of a number of indole alkaloids ofVinca erecta in aqueous ethanolic solution and in chloroform have been determined.
2. It has been shown that the pKa value of an alkaloid in water or in chloroform is not connected with the pH of the transition from chloroform into a buffer solution.
3. It is impossible to estimate the basicity of an alkaloid from its pKa value.
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Literature cited
A. P. Orekhov, The Chemistry of the Alkaloids [in Russian], Moscow (1955).
B. P. Nikol'skii, Theoretical and Practical Handbook of Physical Chemistry [in Russian], Leningrad, Part II (1967).
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Additional information
Institute of the Chemistry of Plant Substances, Academy of Sciences of the Uzbek SSR. Translated from Khimiya Prirodnykh Soedinenii, No. 1, pp. 57–59, January–February, 1973.
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Artykova, T., Aripov, K.N. & Shakirov, T.T. The connection between the ionization constants of alkaloids and their basicities. Chem Nat Compd 9, 50–51 (1973). https://doi.org/10.1007/BF00580890
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DOI: https://doi.org/10.1007/BF00580890