Abstract
1. Four complexes of potassium bis-(N-3(or 5)-substituted salicylidene-S-valinato)cobaltate (III) were synthesized, where the salicylaldehyde residue was substituted in the 5-position with Br, CH3, and NO2 groups and in the 3-position with the CH3 group. The diastereomers Λ (SS) and Δ (SS) of the complexes were separated, the structure and configuration demonstrated by elementary analysis and physical methods. The kinetics of the base-catalyzed epimerization of the complexes in aqueous solutions was studied. The rate constants and activation parameters of the epimerization were found. 2. The electronic influence of the substituents in the 5-position on the rate of exchange of a proton of the neighboring ligand is transmitted according to resonance and inductive mechanisms through the phenolic oxygen atom and increases the stereoselectivity with increasing electron acceptor properties of the substituents. 3. An increase in steric hindrances close to the reaction reaction center the stereoselectivity in the series studied.
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