Collect. Czech. Chem. Commun. 1985, 50, 1184-1193
https://doi.org/10.1135/cccc19851184

Effects of salt concentration and counterion on stability of alkali ion-18-crown-6 complexes in aqueous and methanolic solution: A conflicting evidence from potentiometric and sodium-23 NMR studies

Jiří Závada, Václav Pechanec, Jaroslav Zajíček, Ivan Stibor and Antonín Vítek

Institute of Organic Chemistry and Biochemistry, Czechoslovak Academy of Sciences, 166 10 Prague 6

Individual author index pages


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    2001, Vol. 66, Issue 4, pp. 641–662 [Abstract]
  • Jaroslav Podlaha, Ivana Císařová, Daniel Alexander, Petr Holý, Tomáš Kraus and Jiří Závada*
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    2000, Vol. 65, Issue 10, pp. 1587–1596 [Abstract]
  • Roman Holakovský, Martin Hovorka and Ivan Stibor*
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  • Pavel Lhoták*, Václav Šťastný, Petra Zlatušková, Ivan Stibor, Veronika Michlová, Marcela Tkadlecová, Jaroslav Havlíček and Jan Sýkora
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  • Daniel Alexander, Stanislav Böhm, Ivana Císařová, Petr Holý, Jaroslav Podlaha, Miroslav Šlouf and Jiří Závada*
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  • Martin Chadim, Miloš Buděšínský, Jana Hodačová and Jiří Závada*
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  • Jana Hodačová* and Ivan Stibor
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  • Zbyněk Matušina, Radomíra Olbřímková, Hana Votavová, Josef Neumann, Martin Hradilek, Milan Souček, Petr Maloň, Milan Kodíček and Ivan Stibor*
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  • Abd El-Galil Amr, Osama I. Abd El-Salam, Abd El-Hamid Attia and Ivan Stibor*
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  • Petr Vaňura and Ivan Stibor
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    1998, Vol. 63, Issue 12, pp. 2009–2014 [Abstract]
  • Tomáš Kraus, Miloš Buděšínský and Jiří Závada
    Novel Amphiphilic Cyclodextrins: Per[6-deoxy-6-(4,5-dicarboxy-1,2,3-triazol-1-yl)-2,3-di-O-methyl] Derivatives
    1998, Vol. 63, Issue 4, pp. 534–540 [Abstract]
  • Miloš Tichý, Luděk Ridvan, Miloš Buděšínský, Jiří Závada, Jaroslav Podlaha and Ivana Císařová
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    1998, Vol. 63, Issue 2, pp. 211–221 [Abstract]
  • Miloš Tichý, Jana Günterová and Jiří Závada
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    1997, Vol. 62, Issue 7, pp. 1080–1088 [Abstract]
  • Vít Lellek and Ivan Stibor
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    1997, Vol. 62, Issue 1, pp. 83–98 [Abstract]
  • Miloš Tichý, Luděk Ridvan and Jiří Závada
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    1997, Vol. 62, Issue 1, pp. 62–68 [Abstract]
  • Jaroslav Havlíček, Marcela Tkadlecová, Michaela Vyhnánková, Evgueni Pinkhassik and Ivan Stibor
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    1996, Vol. 61, Issue 12, pp. 1783–1797 [Abstract]
  • Daniel Alexander, Petr Holý, Pavel Fiedler, Zdeněk Havlas and Jiří Závada
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    1996, Vol. 61, Issue 10, pp. 1464–1472 [Abstract]
  • Evgueni Pinkhassik, Ivan Stibor and Vladimír Havlíček
    Synthesis of New Chiral Ligands by Capping of Calix[4]arene Derivatives
    1996, Vol. 61, Issue 8, pp. 1182–1190 [Abstract]
  • Jaroslav Podlaha, Ivana Císařová, Martin Bělohradský and Jiří Závada
    Crystal and Molecular Structure of cis-2,2',3',2"-Tetraacetoxy-1,1':4',1"-ternaphthyl
    1996, Vol. 61, Issue 5, pp. 726–732 [Abstract]
  • Miloš Tichý and Jiří Závada
    Preparation of (R)-(-)-6,6'-Bis(3,5-dinitrobenzamido)biphenyl-2,2'-dicarboxylic Acid, a Potential Chiral HPLC Selector
    1995, Vol. 60, Issue 12, pp. 2161–2164 [Abstract]
  • Jaroslav Zajíček, Jeffrey F. Ellena, Gerald D. Williams, Mohammad A. Khadim and Michael F. Brown
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    1995, Vol. 60, Issue 5, pp. 719–735 [Abstract]
  • Miloš Tichý, Jana Holanová, Ivo Starý, Irena G. Stará and Jiří Závada
    Axially Chiral Selectors of C2 Symmetry Bound to Silica: Synthesis and HPLC-Evaluation
    1995, Vol. 60, Issue 4, pp. 645–658 [Abstract]
  • Martin Bělohradský, Petr Holý, Juraj Koudelka and Jiří Závada
    1,2-Bis(azacrown)ethanes: Effect of Bridge Substitution and Ring Size on Formation of Sandwich Complexes with Sodium and Potassium Ions
    1993, Vol. 58, Issue 1, pp. 153–158 [Abstract]
  • Ivan Veselý, Jaroslav Paleček and Ivan Stibor
    Resolution of a Racemic Corey Lactone via Enantioselective Esterification
    1992, Vol. 57, Issue 2, pp. 357–361 [Abstract]
  • Luboš Arnold, Jiří Smrt, Jaroslav Zajíček, Günther Ott, Michael Schiesswohl and Mathias Sprinzl
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    1991, Vol. 56, Issue 9, pp. 1948–1956 [Abstract]
  • Petr Holý, Juraj Koudelka, Martin Bělohradský, Ivan Stibor and Jiří Závada
    Bis(monoazacrown ether)s: Effects of bridge length and ring size on stability and selectivity in alkali ion sandwich complex formation
    1991, Vol. 56, Issue 7, pp. 1482–1488 [Abstract]
  • Alexander Kasal, Jenny Pokorná and Jaroslav Zajíček
    3β,11α,17-Trihydroxy-5-pregnen-20-one 11-hemisuccinate as a haptene for RIA of "17α-hydroxypregnenolone"
    1991, Vol. 56, Issue 6, pp. 1340–1347 [Abstract]
  • Alexander Kasal, Jaroslav Podlaha and Jaroslav Zajíček
    A-homo-B,19-dinorandrostanes from 6β-methanesulfonyloxy-5-methyl-19-nor-5β-androst-9-ene derivatives
    1991, Vol. 56, Issue 5, pp. 1070–1086 [Abstract]
  • Ivan Stibor, David Šaman and Pavel Fiedler
    Synthesis and conformation of some 6-aminomethyluracil amides
    1990, Vol. 55, Issue 11, pp. 2731–2737 [Abstract]
  • Jiří Závada, Václav Pechanec and Oldřich Kocián
    Anion effect on alkali ion-crown complex formation in a moderately concentrated solutions: A sensitive probe of hidden interionic interactions operating in dissociating protic solvents
    1990, Vol. 55, Issue 5, pp. 1149–1161 [Abstract]
  • Jiří Závada and Magdalena Pánková
    Preferential cis-olefin formation: A striking resemblance between alkali-alkoxide and alumina promoted eliminations in low polar solvents
    1990, Vol. 55, Issue 3, pp. 704–709 [Abstract]
  • Jiří Závada, Magdalena Pánková and Antonín Vítek
    On the origin of base concentration effect on stereo- and regioselectivity in alkoxide-promoted E2 reactions: A consequence of substrate solvation by metal ions
    1990, Vol. 55, Issue 3, pp. 695–703 [Abstract]
  • Miroslav Ledvina, Jiří Farkaš, Jaroslav Zajíček, Jan Ježek and Milan Zaoral
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    1989, Vol. 54, Issue 10, pp. 2784–2794 [Abstract]
  • Alois Pískala, Naeem B. Hanna, Jaroslav Zajíček and Alois Čihák
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    1989, Vol. 54, Issue 9, pp. 2502–2512 [Abstract]
  • Ivan Veselý, Václav Kozmík, Václav Dědek, Jaroslav Paleček, Jiří Mostecký and Ivan Stibor
    Large-scale synthesis of racemic “Corey lactone”
    1989, Vol. 54, Issue 6, pp. 1683–1686 [Abstract]
  • Alexander Kasal and Jaroslav Zajíček
    Spontaneous transannular reaction in Δ9-unsaturated A-homo-B,19-dinorsteroids
    1989, Vol. 54, Issue 5, pp. 1327–1335 [Abstract]
  • Farouk Tedjar, Salah Ymmel, Miroslav Janda, Petr Duchek, Petr Holý and Ivan Stibor
    Electrochemical oxidation of pyrrole derivatives in alcoholic medium
    1989, Vol. 54, Issue 5, pp. 1299–1305 [Abstract]
  • Jiří Závada, Juraj Koudelka, Petr Holý, Martin Bělohradský and Ivan Stibor
    Bis(monoazacrown ethers) with an electron-donating substituent at the hinge: A pronounced participation of hydroxyl group in formation of sodium ion sandwich complexes
    1989, Vol. 54, Issue 4, pp. 1043–1054 [Abstract]
  • Petr Holý, Martin Bělohradský, Ivan Stibor, Juraj Koudelka, David Šaman, Jana Hodačová, Antonín Holý and Jiří Závada
    Crown and azacrown ethers with pendant adenine group
    1987, Vol. 52, Issue 12, pp. 2971–2982 [Abstract]
  • Martin Bělohradský, Petr Holý, Ivan Stibor and Jiří Závada
    A versatile synthesis of oligocrown compounds with hydroxyl groups at the hinge
    1987, Vol. 52, Issue 12, pp. 2961–2970 [Abstract]
  • Martin Bělohradský, Ivan Stibor, Petr Holý and Jiří Závada
    A convenient synthesis of crown and azacrown ethers with pendant oxirane group
    1987, Vol. 52, Issue 10, pp. 2500–2507 [Abstract]
  • Ivan Stibor, Oldřich Kocián, Petr Holý and Jiří Závada
    Procedure for large-scale preparations of oligoethylene glycol toluenesulphonates
    1987, Vol. 52, Issue 8, pp. 2057–2060 [Abstract]
  • Ivan Veselý, David Šaman and Ivan Stibor
    Ag(I) complexes of F2α prostaglandins
    1987, Vol. 52, Issue 6, pp. 1583–1588 [Abstract]
  • Václav Černý, Jaroslav Zajíček and Miroslav Strnad
    2α,3α-Dihydroxy-7-oxa-6-oxo-B-homo-5α-pregnan-21-oic acid and its derivatives as brassinolide analogues
    1987, Vol. 52, Issue 1, pp. 215–222 [Abstract]
  • Ivan Bašnák, Jiří Farkaš, Jaroslav Zajíček and Zdeněk Havlas
    Synthesis of anomeric 5-cyclopropyl-2'-deoxyuridines and 1H NMR spectroscopic study of their conformation
    1986, Vol. 51, Issue 8, pp. 1764–1771 [Abstract]
  • Alexander Kasal and Jaroslav Zajíček
    Solvolysis of Westphalen-type compounds
    1986, Vol. 51, Issue 7, pp. 1462–1475 [Abstract]
  • Ladislav Kohout, Vijay Kumar Sethi, Jaroslav Zajíček and Alexander Kasal
    Solvolytic reactions of empiric 3-methanesulfonyloxy-7-benzoyloxy-5β,6β-cyclopropanocholestanes
    1986, Vol. 51, Issue 2, pp. 436–446 [Abstract]
  • Helena Velgová and Jaroslav Zajíček
    Reaction of 3,4a-disubstituted 4,4-dimethyl-5,6β-epoxy-A-homo-5β-cholestane derivatives with reducing agents
    1985, Vol. 50, Issue 11, pp. 2457–2470 [Abstract]
  • Milena Masojídková, Jaroslav Zajíček, Miloš Buděšínský, Ivan Rosenberg and Antonín Holý
    Conformational study on ribonucleoside O-phosphonylmethyl derivatives by 1H NMR spectroscopy
    1985, Vol. 50, Issue 8, pp. 1899–1905 [Abstract]
  • Jiří Joska, Jan Fajkoš and Jaroslav Zajíček
    Synthesis of 3β,4β-cyclopropano-19-nor-A-homosteroids
    1985, Vol. 50, Issue 7, pp. 1611–1617 [Abstract]
  • Zdeněk Jermář, Antonín Vítek, Josef Krupička and Lubomír Šerák
    A simple method of digitalization of polarographic curves. Description of the apparatus
    1985, Vol. 50, Issue 5, pp. 1114–1120 [Abstract]
  • Helena Velgová and Jaroslav Zajíček
    Oxidation and epoxidation of 4,4-dimethyl-A-homo-5-cholesten-4a-ols
    1985, Vol. 50, Issue 1, pp. 114–131 [Abstract]
  • Ladislav Kohout and Jaroslav Zajíček
    Lead tetraacetate oxidation of 3β-acetoxy-B-homo-5α-cholestan-7aβ-ol
    1984, Vol. 49, Issue 1, pp. 301–305 [Abstract]
  • Jaroslav Zajíček, Miloš Buděšínský and Jiří Farkaš
    Conformational study of blocked pentofuranoses and their 1,5-anhydro derivatives by 1H NMR spectroscopy
    1984, Vol. 49, Issue 1, pp. 235–243 [Abstract]
  • Jiří Závada, Josef Krupička, Oldřich Kocián and Magdalena Pánková
    Electrochemical dehalogenation of open-chain vicinal dihalides at mercury cathodes: The effect of leaving group identity on E1/2 values and on steric course
    1983, Vol. 48, Issue 12, pp. 3552–3558 [Abstract]
  • Jiří Joska, Jan Fajkoš and Jaroslav Zajíček
    Bromination of 19-acetoxy-4β,5-cyclopropano-5β-cholestan-3-one
    1983, Vol. 48, Issue 12, pp. 3474–3481 [Abstract]
  • Jan Fajkoš, Jiří Joska and Jaroslav Zajíček
    The bromination of the epimeric 4,5-cyclopropanocholestan-3-ones
    1983, Vol. 48, Issue 12, pp. 3455–3473 [Abstract]
  • Magdalena Pánková, Oldřich Kocián, Josef Krupička and Jiří Závada
    syn-anti Dichotomy in zinc-promoted dehalogenation of open-chain vicinal dihalides: The effect of the leaving groups
    1983, Vol. 48, Issue 10, pp. 2944–2951 [Abstract]
  • Jiří Závada, Václav Pechanec and Oldřich Kocián
    The effect of counterion on alkali ion-crown complex formation: A near-paradox in dissociating solvents
    1983, Vol. 48, Issue 9, pp. 2509–2517 [Abstract]
  • Václav Pechanec, Oldřich Kocián and Jiří Závada
    Crowns in alkali alkoxide-conjugate acid solutions: A remarkably low propensity to complex formation
    1983, Vol. 48, Issue 4, pp. 1144–1157 [Abstract]
  • Miroslav Janda, Eva Körblová and Ivan Stibor
    Reaction of substituted γ-crotonolactones under the conditions of the Michael addition
    1983, Vol. 48, Issue 1, pp. 96–102 [Abstract]
  • Václav Pechanec, Oldřich Kocián and Jiří Závada
    Effects of structure and concentration on ionic association in alkali alkoxide-conjugate acid solutions: Reluctance to formation of ion-pair aggregates
    1982, Vol. 47, Issue 12, pp. 3405–3411 [Abstract]
  • Ivan Stibor, Jan Šrogl, Miroslav Janda, Naděžda Piričová and Karel Vlažný
    Electrosyntheses of 3-acetyl- and 3-methoxycarbonyl-2,5-dimethoxy-2,5-dihydrofuranes
    1982, Vol. 47, Issue 12, pp. 3261–3267 [Abstract]
  • Ivan Stibor, Jan Šrogl, Miroslav Janda, Naděžda Piričová and Karel Vlažný
    An-Additions to 2,5-dimethoxy-2,5-dihydrofurans, containing electron-accepting substituents in position 3
    1982, Vol. 47, Issue 11, pp. 3055–3061 [Abstract]
  • Antonín Vítek and Josef Krupička
    Distinguishing some types of one-electron reversible processes according to different polarographic wave forms
    1982, Vol. 47, Issue 11, pp. 2838–2848 [Abstract]
  • Helena Velgová, Jorga Smolíková, Antonín Trka and Antonín Vítek
    Cyclopropyl→cyclobutyl rearrangement in intramolecular cyclization of 3,5-bridged B-secoandrostane-6,7(or 5,7)-diols and mass spectra of products
    1982, Vol. 47, Issue 8, pp. 2280–2290 [Abstract]
  • Oldřich Kocián, Karel Stránský and Jiří Závada
    Heteroanalogues of 1-triacontanol
    1982, Vol. 47, Issue 5, pp. 1356–1366 [Abstract]
  • Oldřich Kocián, Karel Stránský and Jiří Závada
    Unsaturated analogues of 1-triacontanol
    1982, Vol. 47, Issue 5, pp. 1346–1355 [Abstract]
  • Jiří Závada, Magdalena Pánková and Antonín Vítek
    The search for the active base operating in alkoxide promoted E2 reactions in low polar solvents: A kinetic analysis of the elusive problem
    1981, Vol. 46, Issue 13, pp. 3247–3263 [Abstract]
  • Václav Pechanec, Oldřich Kocián, Vlastimil Halaška, Magdalena Pánková and Jiří Závada
    Degrees of association of alkali tert-butoxides in tert-butanol in the absence and in the presence of crowns: An ebulliometric study
    1981, Vol. 46, Issue 9, pp. 2166–2177 [Abstract]
  • Miroslav Janda, Jan Šrogl, Hana Dvořáková, Dalimil Dvořák and Ivan Stibor
    Electrooxidation of 2-arylfurans
    1981, Vol. 46, Issue 4, pp. 906–916 [Abstract]
  • Jiří Závada, Magdalena Pánková, Richard A. Bartsch and Bong Rae Cho
    The effect of base concentration on orientation in E2 reactions: A common feature in metal alkoxide promoted olefin formation from alkyl halides and tosylates
    1981, Vol. 46, Issue 4, pp. 850–855 [Abstract]
  • Zuzana Machková and Jiří Závada
    The effect of phenyl substituents on elimination stereochemistry: A mechanistic manifold in alkoxide promoted decomposition of 1-phenyl-1-propyltrimethylammonium ion
    1981, Vol. 46, Issue 4, pp. 833–849 [Abstract]
  • Magdalena Pánková and Jiří Závada
    The effect of crown ether on steric hindrance to base approach in bimolecular elimination: evidence against clump aggregate model of ion-paired alkoxide base
    1980, Vol. 45, Issue 11, pp. 3150–3159 [Abstract]
  • Jiří Závada and Magdalena Pánková
    The effect of steric size of leaving group on rates of the competing syn- and anti-pathways in biomolecular elimination
    1980, Vol. 45, Issue 8, pp. 2171–2178 [Abstract]
  • Miroslav Janda, Jan Šrogl, Eva Körblová and Ivan Stibor
    Electrochemical oxidation of 2-furylacetic acid derivatives
    1980, Vol. 45, Issue 5, pp. 1361–1365 [Abstract]
  • Jan Šrogl, Miroslav Janda, František Liška and Ivan Stibor
    Stereoselective photochemical addition of acetaldehyde to the products of Clauson-Kaas reaction
    1980, Vol. 45, Issue 3, pp. 888–891 [Abstract]
  • Roman Řeřicha, Antonín Vítek, Dana Kolihová, Václav Sychra, Zdeněk Šír and Jiří Hetflejš
    Asymmetric distribution of a metal in a heterogenized homogeneous catalyst
    1979, Vol. 44, Issue 11, pp. 3183–3193 [Abstract]
  • Jiří Závada and Magdalena Pánková
    The syn-anti dichotomy in bimolecular elimination of alkyltrimethylammonium salts: Steric and polar effects on rates and orientation in the competing pathways
    1979, Vol. 44, Issue 4, pp. 1273–1295 [Abstract]
  • Ivan Stibor, Petr Trška, Jan Šrogl and Miroslav Janda
    INDO calculations and 1H- and 13C-NMR spectra of furan methyl derivatives
    1978, Vol. 43, Issue 8, pp. 2170–2173 [Abstract]
  • Jan Šrogl, Miroslav Janda, Ivan Stibor, Jan Kos and Vlastimil Vyskočil
    Electrochemical oxidation of benzothiophenes
    1978, Vol. 43, Issue 8, pp. 2015–2023 [Abstract]
  • Ivan Stibor, Miroslav Janda and Jan Šrogl
    Synthesis of conjugated systems based on furane
    1978, Vol. 43, Issue 6, pp. 1481–1483 [Abstract]
  • Jiří Závada and Magdalena Pánková
    E2-SN2 Competition: The effect of crown ether, leaving group and solvent in the reaction of 1-nonyl derivatives with potassium tert-butoxide
    1978, Vol. 43, Issue 4, pp. 1080–1086 [Abstract]