Conclusions
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1.
The reversible replacement of methanol by methylate ion in the equatorial plane of the copper complex of N-salicylidene-S-valine has been studied spectrophotometrically; study has also been made of the kinetics of the MeO− ion-catalyzed racemization of the S-valine fragment of this complex in methanol solution at 25°C.
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2.
Pyridine and N-salicylidene-S-valine form a mixed complex with copper ions, the kinetic CH-acidity of this complex being higher than that of copper N-salicylidene-S-valinate.
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3.
N-2-Pyridinecarbonyl-2-aminobenzaldehyde has been synthesized and its Schiff base with S-valine used as ligand in a copper complex. Under the action of MeO−, the S-valine fragment of this complex racemizes 90 times more rapidly than the S-valine fragment of copper N-salicylidene-S-valinate.
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Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 10, pp. 2276–2283, October, 1978.
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Belokon', Y.N., Belikov, V.M., Maksakov, V.A. et al. Amino acids as CH-acids 17. Increase in the amino acid α-proton mobility in Schiff base copper complexes with pyridine or N-2-pyridinecarbonyl-2′-aminobenzaldehyde ligands. Russ Chem Bull 27, 2014–2020 (1978). https://doi.org/10.1007/BF00946517
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DOI: https://doi.org/10.1007/BF00946517