Catalytic activity and complexation—I influence of organic solvents on the rate of catalytic decarboxylation of oxalacetic acid

Bontchev, P.R.; Michaylova, V.

doi:10.1016/0022-1902(67)80127-1

Cited by 10 publications

(3 citation statements)

References 15 publications

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“…Effective ligands are 2,2'-bipyridyl [37], 1,lO-phenanthroline [38,39], and pyridine [40] ; they all contain n-systems. Of interest in this connection is also that the hydrolysis of diisopropyl fluorophosphate is catalyzed by several Cu2+ complexes, among which the Cu2+-bipyridyl I : 1 complex is especially effective.…”

Section: Discussionmentioning

confidence: 99%

Ternary Complexes in Solution

Huber

Griesser

Prijs

et al. 1969

European Journal of Biochemistry

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The stability constants of the ternary Cuz+ complexes, ethylenediamine-Cu2+-pyrocatechol and histamine-Cua+-pyrocatechol dianion, were determined. Both complexes are more stable than one would expect on pure statistical reasons. The imidazole-containing ternary Cuz+ complex is, however, especially stable. For the equilibrium, Cu(histamine), + Cu(pyrocatechol), ~2[(histamine)Cu(pyrocatechol)], the constant is log X = 4.86 (I = 0.1; T = 25"), while the statistical value is 0.6. These results were compared with those taken (or calculated) from the literature; it is concluded that the n-system of the ligands is important for such a great increase in stability. Furthermore, the Cuz+-histamine I : 1 complex selectively binds to 0-ligands rather than to N-ligands. Thus, the first coordinated ligand has an influence on the kind of the second to be coordinated, i. e. the Cua+-histamine 1 : 1 complex shows discriminating qualities. The significance of these results is discussed with regard to Cu-proteins, since it is suggested for several enzymes that the imidazole group of histidine is involved with the binding of metal ions.I n general, ternary complexes, i.e. mixed ligand metal ion complexes, can be considered as models [2] for enzyme-metal ion-substrate complexes [3,4]. Furthermore, such ternary complexes probably occur in biological fluids that contain several ligands as well as different metal ions. Investigations of the stability of ternary complexes may, therefore, help toward understanding the driving forces which lead to the formation of such complexes in biological systems. The importance of mixed complexes in nature is evident, since a great deal of biochemical reactions occur in such complexes, i.e. within the coordination sphere of metal ions [3,4].I n addition, the investigation of ternary Cu2+ complexes, containing an imidazole group as binding site, is of special interest, since it is suggested for several proteins which interact with Cua+ and for natural Cu-proteins that the imidazole group of histidine binds to copper. Thus, the Cuz+ complexes of several histidine-containing peptides

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Section: Discussionmentioning

confidence: 99%

Ternary Complexes in Solution

Huber

Griesser

Prijs

et al. 1969

European Journal of Biochemistry

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“…p-Ketodicarbonsauren wurden zuerst von Bontche» und Mitarb. fur analytische Bestimmungen von Zn 2+, Mg2+ und Cu 2+ ausgenutzt [45], [46]. Die katalytische \Virkung von Mangan(II)-und Nickel(II)-Verbindungen auf die Decarboxylierung von Dimethyloxalessigsaure wurde von Rund et al [80] untersucht.…”

Section: Etallkatalysierte Dissoziationsreaktionenunclassified

Homogene Katalyse in der quantitativen chemischen Analytik

Müller

Werner

1976

Zeitschrift fuer Chemie

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“…For this same reason the catalytic effects of various metal cations (8)(9)(10)(11)(12)(13)(14)(15), amines (1, 4, [16][17][18], and amino acids (19,20) upon the decarboxylation have been investigated.…”

Section: Introductionmentioning

confidence: 99%

Micellar Effects upon p-n-Butylaniline Catalyzed Decarboxylation of Oxalacetic Acid

Lam¹,

Schmidt²

1973

Can. J. Chem.

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p-n-Butylaniline ([nBA] = 1 × 10−3 M) incorporated in cationic micelles of cetyltrimethylammonium bromide ([CTABr] = 6 × 10−3M) was found to enhance the rate of decarboxylation of oxalacetic acid (OAA) 45-fold while nBA alone only increases the rate six-fold as compared to the rate of spontaneous decarboxylation at the same pH. Anionic micelles of sodium dodecyl sulfate ([SDS] = 6 × 10−3 M) completely inhibited the catalytic effect of nBA. Together with the effects of added salts and the change of pH on the rate of the reaction the role of micelles in the decarboxylation of OAA is discussed.

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Catalytic activity and complexation—I influence of organic solvents on the rate of catalytic decarboxylation of oxalacetic acid

Cited by 10 publications

References 15 publications

Ternary Complexes in Solution

Ternary Complexes in Solution

Homogene Katalyse in der quantitativen chemischen Analytik

Micellar Effects upon p-n-Butylaniline Catalyzed Decarboxylation of Oxalacetic Acid

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