Search Results - "Kvı́čala, Jaroslav"

Mechanism of Alkyl Chloroformate-Mediated Esterification of Carboxylic Acids in Aqueous Media by Opekar, Stanislav, Kvíčala, Jaroslav, Moos, Martin, Pejchal, Vladimír, Šimek, Petr

“…The protection of carboxyl groups by esterification has been the most common method in macroscale and microscale chemistries. The esterification is usually…”
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Simultaneous determination of oxo- and thio-arsenic species using HPLC-ICP-MS by Kaňa, Antonín, Sadowska, Martyna, Kvíčala, Jaroslav, Mestek, Oto

“…•Simultaneous determination of oxo- and thio-arsenic species using HPLC-ICP-MS.•Determination of oxo- and thio-arsenic species in food samples.•Preparation of…”
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Non‐Symmetrical Tetrafluoroalkadienes Synthesized by ROCM of 3,3,4,4‐Tetrafluorocyclobutene by Kučnirová, Kateřina, Kvíčala, Jaroslav, Svoboda, Martin, Cvačka, Josef, Čejka, Jan, Rybáčková, Markéta

“…As the first known example of ring‐opening cross metathesis (ROCM) of polyfluorinated strained cyclobutenes, ROCM of 3,3,4,4‐tetrafluorocyclobutene with…”
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Modified aryldifluorophenylsilicates with improved activity and selectivity in nucleophilic fluorination of secondary substrates by Trojan, Michal, Hroch, Adam, Gruden, Evelin, Cvačka, Josef, Čejka, Jan, Tavčar, Gašper, Rybáčková, Markéta, Kvíčala, Jaroslav

“…Nucleophilic fluorination of secondary aliphatic substrates, especially of halides, still remains a challenge. Among the available reagents, TBAT belongs to…”
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Synthesis, catalytic activity and medium fluorous recycle of fluorous analogues of PEPPSI catalysts by Šimůnek, Ondřej, Rybáčková, Markéta, Svoboda, Martin, Kvíčala, Jaroslav

“…[Display omitted] •A library of fluorous analogues of PEPPSI palladium catalysts was synthesized.•Fluorous PEPPSI catalyst was recycled by medium fluorous…”
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Complexation of the lithium cation with N,N,N',N'-tetracyclohexyl-1,2-phenylenedioxydiacetamide: experimental and theoretical study by Makrlík, Emanuel, Kvíčala, Jaroslav, Vaňura, Petr

“…On the basis of extraction experiments and γ-activity measurements, the extraction constant corresponding to the equilibrium Li + (aq) + 1·Na + (nb) 1·Li +…”
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Structural Assignment of Fluorocyclobutenes by 19F NMR Spectroscopy – Comparison of Calculated 19F NMR Shielding Constants with Experimental 19F NMR Shifts by Kučnirová, Kateřina, Šimůnek, Ondřej, Rybáčková, Markéta, Kvíčala, Jaroslav

“…Although the optimized reduction of perfluorocyclobutene with LiAlH4 gave a quantitative yield of the target 3,3,4,4‐tetrafluorocyclobut‐1‐ene, unoptimized…”
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Ring-closing metathesis of prochiral oxaenediynes to racemic 4-alkenyl-2-alkynyl-3,6-dihydro-2H-pyrans by Kolaříková, Viola, Rybáčková, Markéta, Svoboda, Martin, Kvíčala, Jaroslav

“…The prochiral 4-(allyloxy)hepta-1,6-diynes, optionally modified in the positions 1 and 7 with an alkyl or ester group, undergo a chemoselective ring-closing…”
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Synthesis of Heavy Fluorous Ruthenium Metathesis Catalysts Using the Stereoselective Addition of Polyfluoroalkyllithium to Sterically Hindered Diimines by Hošek, Jan, Rybáčková, Markéta, Čejka, Jan, Cvačka, Josef, Kvíčala, Jaroslav

“…The stereoselective addition of 2-(perfluorohexyl)­ethyllithium to moderately hindered diimines led to racemic diamines, which were further transformed to…”
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Redox Property Tuning in Bipyridinium Salts by Burešová, Zuzana, Klikar, Milan, Mazúr, Petr, Mikešová, Michaela, Kvíčala, Jaroslav, Bystron, Tomas, Bureš, Filip

“…Bipyridinium salts are currently very popular due to their perspective applications in redox flow batteries. Hence, we designed and prepared a series of…”
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Interaction of Ionic Liquids Ions with Natural Cyclodextrins by Ondo, Daniel, Tkadlecová, Marcela, Dohnal, Vladimír, Rak, Jakub, Kvíčala, Jaroslav, Lehmann, Jochen K, Heintz, Andreas, Ignatiev, Nikolai

“…The interaction of natural α-, β-, and γ-cyclodextrins (CDs) with 14 hydrophobic ionic moieties of ionic liquids (ILs) was systematically examined in dilute…”
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Interaction of the cesium cation with meso-octamethylcalix[4]pyrrole: Experimental and theoretical study by Polášek, Miroslav, Makrlík, Emanuel, Kvíčala, Jaroslav, Křížová, Věra, Petr Vaňura

“…[Display omitted] •Interaction between Cs+ and meso-octamethylcalix[4]pyrrole (1) was investigated.•Electrospray ionization mass spectrometry was used.•Cation…”
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meso-Octamethylcalix[4]pyrrole as an effective macrocyclic receptor for the univalent thallium cation in the gas phase: Experimental and theoretical study by Polášek, Miroslav, Makrlík, Emanuel, Kvíčala, Jaroslav, Křížová, Věra, Vaňura, Petr

“…By using electrospray ionization mass spectrometry (ESI-MS), it was proven experimentally that the univalent thallium cation (Tl+) forms with…”
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Three-Component (Domino) Reaction Affording Substituted Pyrroloquinazolines: Cyclization Regioselectivity and Stereoselectivity by Paleta, Oldřich, Dolenský, Bohumil, Paleček, Jiří, Kvíčala, Jaroslav

“…The cyclization involving 2‐(aminomethyl)aniline, methyl 3,3,3‐trifluoropyruvate, and various oxo compound afforded linearly annulated pyrroloquinazolines, for…”
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Interaction of the univalent silver cation with [Gly6]-antamanide: Experimental and theoretical study by Makrlík, Emanuel, Böhm, Stanislav, Kvíčala, Jaroslav, Vaňura, Petr, Ruzza, Paolo

“…On the basis of extraction experiments and γ-activity measurements, the extraction constant corresponding to the equilibrium Ag+(aq) + 1.Na+(nb) ⇄ 1.Ag+…”
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Cation-π interaction of the univalent silver cation with meso-octamethylcalix[4]pyrrole: Experimental and theoretical study by Polášek, Miroslav, Kvíčala, Jaroslav, Makrlík, Emanuel, Křížová, Věra, Vaňura, Petr

“…By using electrospray ionization mass spectrometry (ESI-MS), it was proven experimentally that the univalent silver cation Ag+ forms with…”
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Ag Complexes of NHC Ligands Bearing Polyfluoroalkyl and/or Polyfluoropolyalkoxy Ponytails. Why Are Polyethers More Fluorous Than Alkyls? by Skalický, Martin, Skalická, Veronika, Paterová, Jana, Rybáčková, Markéta, Kvíčalová, Magdalena, Cvačka, Josef, Březinová, Anna, Kvíčala, Jaroslav

“…A series of fluorous silver complexes bearing two fluorous NHC ligands was synthesized from bis­(polyfluoroalkylated) or bis­(polyfluoropolyoxaalkylated)…”
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Experimental and theoretical study of Hoveyda–Grubbs catalysts modified by perfluorohexyl ponytail in the alkoxybenzylidene ligand by Kvíčala, Jaroslav, Schindler, Martin, Kelbichová, Vendula, Babuněk, Mario, Rybáčková, Markéta, Kvíčalová, Magdalena, Cvačka, Josef, Březinová, Anna

“…Light fluorous alkene metathesis catalysts were synthesized. •Perfluoroalkylation in the alkoxybenzylidene part of Ru catalysts improve activity.•Ru alkene…”
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Medium Fluorous Separation Using Hydrofluoroether and Weakly Polar Solvents for Environmentally Friendly Recycling of Catalysts by Hošek, Jan, Šimůnek, Ondřej, Lipovská, Pavlína, Kolaříková, Viola, Kučnirová, Kateřina, Edr, Antonín, Štěpánková, Nikola, Rybáčková, Markéta, Cvačka, Josef, Kvíčala, Jaroslav

“…As a novel approach to the separation of polyfluorinated compounds, we disclosed that HFE 7100 (methyl perfluorobutyl ether) forms with alkanes or chlorinated…”
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Heavy fluorous phosphine-free ruthenium catalysts for alkene metathesis by Babunek, Mario, Simunek, Ondrej, Hosek, Jan, Rybackova, Marketa, Cvacka, Josef, Brezinova, Anna, Kvicala, Jaroslav

“…Modification of Hoveyda–Grubbs catalyst with perfluoro-polyoxaalkanoates led to heavy fluorous complexes. •Hoveyda–Grubbs complexes gave with…”
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