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  • Author or Editor: R. Kański x
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Abstract  

A synthesis of14C and35S double labelled hexylthiols: C6H13SH–1/1, 2, 3, 4–14C1/4/, /1-thiol[35S]/ and C6H13SSH–2/1, 2, 3, 4–14C1/4/, /2-thiol[35S]/ based on H2 35S and C6H12–/1, 2, 3, 4–14C1/4/ has been developed and described.

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Abstract  

The chemical effects of the decay of35S incorporated into doubly labelled molecules of primary and secondary butylthiols have been studied. The final products, viz.14C4H9Cl-1 and14C4H9Cl-2 were detected by radiometric method. It has been established that in the gas phase about 60% of primary molecular ions are stabilized in form of butyl chlorides. In presence of the water vapour the yield of butyl chlorides increases to about 90%.

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Abstract  

The kinetic behavior of deuteriation of bromobenzoic acids in the presence of homogenous platinum salt catalyst in a medium containing solution of deuteriated acetic acid in heavy water has been studied at 130°C. The quasiunimolecular H/D exchange rate constants for particular position of aromatic ring hydrogens were determined by proton NMR integration signal. The difference in the kinetics patterns of H/D exchange has been shown for the chloro- and bromo-derivatives of benzoic acid.

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Abstract  

One step method for deuteriation of methoxybenzoic acids in the presence of homogeneous divalent platinum salt in medium containing solution of deuteriated acetic acid in heavy water has been elaborated. The quasiunimolecular H/D exchange rate constants at 130 °C for particular position of proton of aromatic ring have been determined by 1H NMR integration signals. The difference of the kinetics patterns of H/D exchange has been shown for the 2-methoxy-, 3-methoxy- and 4-methoxybenzoic acid.

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Abstract  

The kinetic behavior of deuteriation of 2-chloro-, 3-chloro- and 4-chlorobenzoic acids in the presence of homogeneous platinum salt catalyst in a medium containing solution of deuteriated acetic acid in heavy water has been studied at 130°C. The quasiunimolecular H/D exchange rate constants for particular position of aromatic ring hydrogens were determined by1H NMR integration signal.

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Abstract  

The kinetic of deuteration of -phenylpropionic acid with D2O acidified with HCl in the presence of homogeneous K2PtCl4 catalyst has been investigated in the 100–130°C temperature interval. The quasi-unimolecular H/D exchange rate constants at 100 and at 130°C, corresponding to fast H/D exchange process, have been deduced by analysis of the composite integrated NMR signal of the substituted benzene ring hydrogens; the Arrhenius activation energy for this exchange was estimated.

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Abstract  

A one-step method has been elaborated for the deuteriation of hydroxybenzoic acids in the presence of homogeneous divalent platinum salt in a medium containing solution of deuteriated acetic acid in heavy water. The quasiunimolecular H/D exchange rate constants have been determined at 130 °C for the particular position of proton on the aromatic ring by 1H NMR integration signals. Different kinetic patterns of H/D exchange are shown for 2-hydroxy-, 3-hydroxy-, and 4-hydroxybenzoic acid.

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Abstract  

The kinetics of deuteration of 4-methylbenzoic acid in the presence of a homogenous K2PtCl4 in a medium containing 50% solution of deuteriated acetic acid in heavy water has been studied at 130°C. The quasiunimolecular H/D rate constants for the methyl group, the ortho and meta aromatic ring hydrogens were determined by NMR.

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Abstract  

The kinetics of deuteriation of phenylacetic acid with D2O acidified with DCl in the presence of homogeneous K2PtCl4 catalyst has been investigated in the 100–130°C temperature interval. The quasiunimolecular H/D rate constants at 100 and 130°C corresponding exchange processes in -position in side chain and para position of the substituted benzene ring were determined by NMR integration signal. The same constants for ortho and meta positions have been deduced by analysis of the composite NMR signal, and the Arrhenius activation energies for the exchange reactions were estimated.

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Abstract  

The kinetic behavior of deuteriation of benzoic acid with D2O acidified with HCl in the presence of homogeneous K2PtCl4 catalyst has been investigated in the 100–130°C temperature interval. The quasiunimolecular H/D rate constants at 100 and 130°C corresponding to an exchange process in ortho positions of the substituted benzene ring hydrogens were determined by1H NMR integration signal. These same constants for meta and para positions have been deduced by analysis of the composite1H NMR signal, and the Arrhenius activation energies for these exchange reactions were estimated.

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