Conclusions
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1.
The diastereomers of bis-(N-salicylidene-α-hydroxyalaninato)-cobalt(III) undergo epimerization under the effect of bases. A mechanism has been proposed for this process.
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2.
The equilibrium relationships for the three diastereomers of bis-(N-salicylidene-α-hydroxyalaninato) cobalt(III) have been determined in water and acetonitrile. In both solvents the isomer containing ligands with opposite configurations is relatively unfavorable. This demonstrates the need to take into account the interaction between the distant asymmetric centers of the ligands.
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N. G. Faleev, Yu. N. Belokon', V. M. Belikov, L. M. Mel'nikova, and P. V. Petrovskii, Izv. Akad, Nauk. SSSR, Ser. Khim., 2097 (1974).
R. C. Burrows and J. C. Beilar, Jr., J. Amer. Chem. Soc.,88, 4150 (1966).
Yu. N. Belokon', V. M. Belikov, M. M. Dolgaya, and I. I. Kruman, Izv. Akad. Nauk SSSR, Ser. Khim., 1836 (1973).
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Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 3, pp. 649–652, March, 1976.
We thank V. A. Karginov for his advice on the use of the tetrabutylammonium phenoxide-phenol buffer system in acetonitrile.
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Faleev, N.G., Belokon', Y.N., Belikov, V.M. et al. Epimerization of the diastereomers of bis-(N-salicylidene-α-hydroxyalaninato)cobalt (III) under the action of bases and the thermodynamic stereoselectivity in these complexes. Russ Chem Bull 25, 633–635 (1976). https://doi.org/10.1007/BF01106668
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DOI: https://doi.org/10.1007/BF01106668