Zobrazeno 1 - 10
of 30
pro vyhledávání: '"Vojtěch Bekárek"'
Autor:
Barbora Piskláková, Jaroslava Friedecká, Eliška Ivanovová, Eva Hlídková, Vojtěch Bekárek, Matúš Prídavok, Aleš Kvasnička, Tomáš Adam, David Friedecký
Publikováno v:
Clinical Chemistry and Laboratory Medicine (CCLM).
Objectives The analysis of organic acids in urine is an important part of the diagnosis of inherited metabolic disorders (IMDs), for which gas chromatography coupled with mass spectrometry is still predominantly used. Methods Ultra-performance liquid
Autor:
Adam Přibylka, Martin Švidrnoch, Vratislav Smolka, Vojtěch Bekárek, Vítězslav Maier, Juraj Ševčík
Publikováno v:
Journal of Chromatography A. 1467:383-390
A novel capillary electrophoresis–tandem mass spectrometry method for the enantioseparation and identification of 2-hydroxyglutaric acid enantiomers without derivatization for clinical purposes was described. Vancomycin chloride was used as an effi
Publikováno v:
Collection of Czechoslovak Chemical Communications. 62:1754-1762
A series of arylhydrazones 1a-1i was prepared by coupling of arene diazonium salts with ethyl N-(benzo[b]furan-2-yl)carbamate. The hydrazones 1 were thermally cyclized to the corresponding 2-aryl[1]benzofuro[2,3-e][1,2,4]triazin-3(2H)-ones 2a-2i, der
Publikováno v:
Collection of Czechoslovak Chemical Communications. 61:155-159
The wavenumbers of the long-wavelength absorption band were measured for nine 4-substituted and 5-substituted derivatives of 2-nitroaniline in the gaseous state and in 13 solvents where only nonspecific solvent-solute interactions can be expected. Fo
Publikováno v:
Collection of Czechoslovak Chemical Communications. 60:251-256
1H NMR spectra have been measured of seven 3,5-disubstituted 6-oxo-1,6-dihydro-1,2,4-triazines, and tautomerism of these compounds has been evaluated in connection with the nature of substituents, medium, and temperature. The title compounds exist in
Publikováno v:
Collection of Czechoslovak Chemical Communications. 59:2741-2746
Many 1-aryl-6-azauracils derivatives were prepared so far, among them the representation of m-substituted 1-phenyl derivatives is relatively poor. In this communication we report on the synthesis of the starting material - dicarbamate I, which was us
Publikováno v:
Collection of Czechoslovak Chemical Communications. 59:1384-1391
The rate constants of reaction of triethylamine with ethyl bromide have been measured in 13 solvents at the temperatures of 293, 313, 333, and 373 K. The activation entropies in the individual solvents increase when going from nonpolar to dipolar apr
Publikováno v:
Collection of Czechoslovak Chemical Communications. 57:123-133
2-(6-Azauracil-5-yl)benzoic acid (Ib) and its thio analogue Ia give new heterocyclic compounds, 1,2-dihydro-1,2,4-triazino[5,6-c]isocoumarin-3-one (IVb) and analogous 3-thione IVa, respectively, on treatment with N,N'-dicyclohexylcarbodiimide. A seri
Autor:
Taťjana Nevěčná, Vojtěch Bekárek
Publikováno v:
Collection of Czechoslovak Chemical Communications. 55:180-184
The rate constants have been measured of the reactions of methyl iodide with triethylamine (I) and tributylamine (III) at 293 K in twelve aprotic solvents, methyl iodide with tripropylamine (II) at 293, 313, 323, and 333 K in fifteen solvents differi
Autor:
Vojtěch Bekárek
Publikováno v:
Collection of Czechoslovak Chemical Communications. 45:2063-2069
Applicability of the Buckingham cross-term f(D,n2) = (D -1) (n2 - 1)/(2D + 1) (2n2 + 1) for evaluation of solvent shifts has been tested using 12 original and 4 published data sets concerning solvent effects in electronic spectra. The results are com