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V. M. Belikov Yu. N. Belokon' V. A. Karginov N. S. Martinkova M. B. Saporovskaya 《Russian Chemical Bulletin》1976,25(6):1233-1238
| 1. | The formation of protonated and free Schiff's bases from S-alanine and salicylaldehyde was studied quantitatively by the PMR method in the interval of pD 9.0–12.0. |
| 2. | The rate constants of the racemization of S-alanine and its Schiffs base with salicylaldehyde protonated at the nitrogen were determined, and they were compared with the analogous constants for N-salicyl-idene-S-alaninate complexes of Cr(III), Rh(III), and Co(III) and the Schiffs base from pyridoxal and S-alanine. |
| 3. | The basic role of the metal in the model reactions consists of increasing the concentration of reactive particles in solution as a result of coordination of the Schiffs base with the metal ion. |
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Yu. N. Belokon' S. V. Vitt M. M. Dolgaya V. M. Belikov P. V. Petrovskii 《Russian Chemical Bulletin》1972,21(12):2702-2705
Conclusions The tetra- and dicyanoethylation products of the sodium bis-(N-salicylideneglycinato)cobaltate(III) complex were isolated and characterized. The condensation of the complex with methyl acrylate and aeetaldehyde respectively leads to the formation of glutamic acid and racemic threonine.Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 12, pp. 2772–2776, December, 1972. 相似文献
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Yu. N. Belokon' V. A. Karginov V. I. Tararov V. M. Belikov 《Russian Chemical Bulletin》1976,25(1):54-57
| 1. | Diastereomeric complexes of - and -bis-[N-salicylidene-S-alaninato]chromate(III)K and - and -bis-[N-salicylidene-S-valinato]chromate(III)K were synthesized and chromatographically separated. The absolute configuration of the diastereomers was demonstrated with the aid of ORD curves. |
| 2. | The kinetics of the epimerization of - and -bis-[N-salicylidene-S-alaninato]chromate(III)K and - and -bis-[N-salicylidene-S-valinato]chromate(III)K under the action of OH– ions in water was studied: it was shown that the proton of the amino acid fragment is less labile in these complexes than in the isostructural complexes of Co3+ and Rh3+. |
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Summary Two binary bidimensional systems both composed of an oleic acid fatty substance and a polypeptidic compound: poly--benzyl-L-glutamate, and poly--benzyl-L-aspartate have been studied.It is found that the two components are miscible with one another at the air/water interphase and give ideal solutions, as opposed to what is found with the same polypeptides in myristic and arachidic acid mixtures.
With 3 figures and 1 table 相似文献
Zusammenfassung Es werden zwei bidimensionale binäre Systeme, die aus einer fetten Substanz (Ölsäure) und aus einem Polypeptiol (Poly--benzyl-L-glutamat und Poly--benzyl-L-aspartat) zusammengesetzt sind, studiert.Es zeigt sich, daß die beiden Komponenten miteinander an der Grenzfläche H2O — Luft mischbar sind und das sie ideale Lösungen geben, im Gegensatz zu den gleichen Polypeptiden in Mischung mit Arachinsäure oder Myristinsäure.
With 3 figures and 1 table 相似文献
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Sh. Kh. Khalikov M. I. Ismailov S. V. Alieva R. V. Valiev 《Chemistry of Natural Compounds》1982,18(1):85-89
Polypeptides of regular structure with the sequences His-Glu, Ser-Glu, Try-Glu, His-Tyr, and Glu-His have been synthesized by the 2,4,5-trichlorophenyl ester method. Polymerization was carried out in dimethyl sulfoxide and dimethylformamide. The polymers were purified by dialysis against water. In the process of synthesizing the monomers, theα-amino groups of the acids were protected by ortho-nitrophenylsulfenyl (o-NPS-), benzyloxycarbonyl (Z-), and tert-butoxycarbonyl (t-BOC-) groups. The imidazole group of histidine was Z-protected, and the γ-hydroxy group of glutamic acid and the phenolic OH group of tyrosine were benzyl-protected (Bzl-). 相似文献