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Tautomeryzm i aktywność biologiczna β-diketonów, triketonów, β-ketoestrów i β-ketoamidów : mini przegląd

Hansen P. E.

Wiadomości Chemiczne

2017

[Z] 71, 7-8

427--446

The review deals with β-diketones, β-ketoester, β-ketoamides, triketones, their tautomerism and biological activity. In addition, it covers briefly methods to detect tautomerism in particular NMR and deuterium isotope effects on chemical shifts, both primary and secondary. A number of typical systems are treated such as: usnic acid, tetracyclines, piroxicam, curcurmines, humulones, acyltetramic acids and quinolone 3-esters.

Equilibrium and rate of iron(III) extraction from chloride solutions by individual hydrophobic extractants and their mixtures

Staszak K., Cierpiszewski R., Prochaska K.

Polish Journal of Chemical Technology

2011

Vol. 13, nr 1

1-5

The main goal of this work was to study and compare the rate of iron(III) extraction from chloride solutions by commercial extractants: Alamine 336, TOPO and LIX 54 and their mixtures. Using the interfacial tension data, obtained for mixed systems, the values of surface mole fraction and molecular interaction parameter of extractants were estimated. Determination of the extraction rates was performed by using the Lewis-type stirred transfer cell. It was found that the extraction efficiency of extractants are changed in the following order: Alamine 336>TOPO>β-diketone. The addition of a chelating extractant to the system decreases the extraction efficiency, for example the addition of β-diketone to TOPO decreases the extraction efficiency by about 50%.