Conclusions
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1.
The dependence of the position of the equilibrium between the meso- and racemic forms of diaminopimelic acid (DPA) on the pH was studied, and their dissociation constants at 22 and 60° were determined.
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2.
The particular equilibrium constants of differently ionized forms of DPA were determined, and it was shown that for the bis-protonated bianion, the racemic form of DPA is more stable, for the monoprotonated form the meso-form, and for the bianion the stability of the two isomers is the same.
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3.
The observable differences in the values of the particular constants are explained by intramolecular interaction of the charged groups in the DPA molecule.
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Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 9, pp. 1951–1955, September, 1972.
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Belikov, V.M., Kotova, G.A. & Belokon', Y.N. Configurational equilibrium ofα,α′-diaminopimelic acid in aqueous solution at various pH. Russ Chem Bull 21, 1894–1897 (1972). https://doi.org/10.1007/BF00854600
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DOI: https://doi.org/10.1007/BF00854600