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  • Author or Editor: L. Vasaros x
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Abstract  

Gas—liquid-chromatographic techniques for the separation of a large variety of mono-, di-and polysubstituted benzene derivatives from their multicomponent systems have been developed for the study of reactions of recoil halogen atoms with aromatic compounds. The18F,34mCl,38Cl,82Br and128I labelled benzene derivatives were produced by neutron irradiations of the corresponding liquid mixtures. Because of the short half-life of most of the isotopes in question a relatively fast method was required, therefore each of the techniques described takes less than one hour to achieve the separation.

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Abstract  

The complex formation of astatine/I/ cation with diethylene triamine pentaacetic acid /DTPA/ and characterization of the complexes were investigated by electromigration in free electrolytes and by gel-chromatography on Sephadex G 25. We describe the conjugation procedure for the production of At-DTPA conjugated polyclonal antibodies.

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Abstract  

The dissociation energy of C–At bond /DC–At/ in a number of astatobenzene derivatives has been determined by pyrolytic method. The values of DC–At for the astatoaromatic compounds investigated have been found to be independent of the substituents and their relative position in the astatoaromatic system.

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Abstract  

Electrophilic aromatic astatination of equimolar mixtures of benzene and its derivatives has been studied in acid homogeneous medium. It has been quantitatively estimated, on the basis of the Hammett equation, how the properties of substitutients influence the yield of reaction products.

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Abstract  

Carrier-free astatotyrosine has been synthesized using an electrophilic reaction in acidic media. Temperature of 150–160°C and reaction time of 20–30 min were chosen as optimal conditions for the synthesis of astatotyrosine. Under the selected conditions the yield was about 90%.

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