Search results for: Antonín Lyčka

Items from 1 to 20 out of 87 results

article

Environmental emissions dispersion modelling, principles and algorithms; cross-border CZ-PL course for master’s students

Vladimír Štěpánek, Jan Kříž, Lidmila Hyšplerová, Josef Keder, more

Chemistry-Didactics-Ecology-Metrology > 2022 > R. 27, NR 1-2 > 165--181

Regular mathematical modelling of the dispersion of emissions from large sources is required by law in all EU countries. It is also used in risk analysis to predict releases of toxic substances from various technologies, from volcanic activity and possibly also terrorist acts. However, there is a shortage of experts in this very specific and demanding profession in the labour market in most EU countries...

article

Lewis Superacidic Tellurenyl Cation‐Induced Electrophilic Activation of an Inert Carborane

Martin Hejda, Daniel Duvinage, Enno Lork, Antonín Lyčka, more

Chemistry – A European Journal > 27 > 59 > 14577 - 14581

The aryltellurenyl cation [2‐(tBuNCH)C₆H₄Te]⁺, a Lewis super acid, and the weakly coordinating carborane anion [CB₁₁H₁₂]⁻, an extremely weak Brønsted acid (pK_a=131.0 in MeCN), form an isolable ion pair complex [2‐(tBuNCH)C₆H₄Te][CB₁₁H₁₂], in which the Brønsted acidity (pK_a 7.4 in MeCN) of the formally hydridic B−H bonds is dramatically increased by more than 120 orders of magnitude. The electrophilic...

article

Front Cover: Lewis Superacidic Tellurenyl Cation‐Induced Electrophilic Activation of an Inert Carborane (Chem. Eur. J. 59/2021)

Martin Hejda, Daniel Duvinage, Enno Lork, Antonín Lyčka, more

Chemistry – A European Journal > 27 > 59 > 14560 - 14560

In a metastable N‐coordinated Lewis superacidic tellurenyl cation–carborane ion pair, the Te atom is trying to steal the H atom with help of a N atom. However, although at first glance the N atom is helping, he is actually planning to steal the asset for himself. The Town Musicians came to scare off the robbers, but they arrived too late, and thus nothing can stop nitrogen's plan. The broken window...

article

Diorganotin Compounds Containing α‐Aminoacidato Schiff Base Ligands Derived from Functionalized 2‐Hydroxy‐5‐(aryldiazenyl)benzaldehyde. Syntheses, Structures and Sensing of Hydrogen Sulfide

Tushar S. Basu Baul, Anurag Chaurasiya, Monosh Rabha, Snehadrinarayan Khatua, more

European Journal of Inorganic Chemistry > 2020 > 18 > 1803 - 1813

Three novel bicycloazastannoxides, namely, [nBu₂Sn(L¹)] (1), [nBu₂Sn(L²)] (2) and [Bz₂Sn(L³)] (3) were synthesized in one pot procedures by reacting diorganotin(IV) precursors with a mixture composed of an α‐amino acid with either (E)‐2‐hydroxy‐5‐((4‐nitrophenyl)diazenyl)benzaldehyde or (E)‐2‐hydroxy‐5‐(phenyldiazenyl)benzaldehyde. Single‐crystal X‐ray diffraction analysis reveal that compound 1 is...

article

Imidazo[1,2‐c]pyrimidin‐5(6H)‐one as a novel core of cyclin‐dependent kinase 2 inhibitors: Synthesis, activity measurement, docking, and quantum mechanical scoring

Haresh Ajani, Josef Jansa, Cemal Köprülüoğlu, Pavel Hobza, more

Journal of Molecular Recognition > 31 > 9 > n/a - n/a

We report on the synthesis, activity testing, docking, and quantum mechanical scoring of novel imidazo[1,2‐c]pyrimidin‐5(6H)‐one scaffold for cyclin‐dependent kinase 2 (CDK2) inhibition. A series of 26 compounds substituted with aromatic moieties at position 8 has been tested in in vitro enzyme assays and shown to inhibit CDK2. 2D structure‐activity relationships have ascertained that small substituents...

article

Organosilicon and ‐germanium Hydrides in Catalyst‐Free Hydrometallation Reactions

Roman Jambor, Antonín Lyčka

European Journal of Inorganic Chemistry > 2017 > 42 > 4887 - 4898

Group 14 element hydrides in oxidation states +IV and +II can undergo hydroelementation reactions through addition of the E–H bonds to unsaturated bonds. The neutral group 14 element(IV) hydrides do not have suitable vacant valence orbitals and as a result are only poorly effective for the hydroelementation of unsaturated bonds without addition of any initiators; however, their low‐valent analogues...

article

Design, synthesis and antitubercular potency of 4-hydroxyquinolin-2(1H)-ones

Maíra Bidart de Macedo, Roman Kimmel, Damijana Urankar, Martin Gazvoda, more

European Journal of Medicinal Chemistry > 2017 > 138 > C > 491-500

In this study, a 50-membered library of substituted 4-hydroxyquinolin-2(1H)-ones and two closely related analogues was designed, scored in-silico for drug likeness and subsequently synthesized. Thirteen derivatives, all sharing a common 3-phenyl substituent showed minimal inhibitory concentrations against Mycobacterium tuberculosis H37Ra below 10 μM and against Mycobacterium bovis AN5A below 15 μM...

article

Spectral Characteristic and Preliminary Anticancer Activity in vitro of Selected Rhodanine‐3‐carboxylic Acids Derivatives

Iwona Stawoska, Waldemar Tejchman, Olga Mazuryk, Antonín Lyčka, more

Journal of Heterocyclic Chemistry > 54 > 5 > 2889 - 2897

Selected rhodanine‐3‐carboxylic acids derivatives were synthesized to determine the influence of the structure and the length of the linker between the carboxyl group and the nitrogen atom (N‐3) in the 2‐thioxo‐4‐thiazolidinone ring on their activity, monitored via interactions with human serum albumin. Based on fluorescence studies, we concluded that the length of the linker has a limited impact...

article

4-Carboxyl-2,6-dinitrophenylazohydroxynaphthalenes tautomerism NMR re-explained

Antonín Lyčka

Dyes and Pigments > 2017 > 142 > C > 51-54

(1Z)-1-[2-(2-Nitrophenyl)hydrazinylidene]naphthalen-2(1H)-one (1), (4Z)-5-methyl-2-phenyl-4-(2-phenylhydrazinylidene)-2,4-dihydro-3H-pyrazol-3-one (2), (4Z)-5-methyl-4-[2-(2-nitrophenyl)hydrazinylidene]-2-phenyl-2,4-dihydro-3H-pyrazol-3-one (3) and 3,5-dinitro-4-[(2Z)-2-(2-oxonaphthalen-1(2H)-ylidene)hydrazinyl]benzoic acid (4) were prepared and one- and two-dimensional ¹⁵N, ¹³C and ¹H NMR spectra...

article

Preparation and characterization of novel double-decker rare-earth phthalocyanines substituted with 5-bromo-2-thienyl groups

Jiří Černý, Lenka Dokládalová, Petra Horáková, Antonín Lyčka, more

Chemistry Central Journal > 2017 > 11 > 1 > 1-9

Background A series of rare-earth bisphthalocyanines of praseodymium, samarium and gadolinium bearing 5-bromo-2-thienyl substituents were prepared for the first time. Results Three bis[octakis(5-bromo-2-thienyl)] rare-earth metal(III) bisphthalocyanine complexes (Pr, Sm, Gd) were synthesized for the first time. The new compounds were characterized by UV–vis, NIR, FT-IR, mass spectroscopy and thermogravimetry...

article

Reaction of 3-chloroquinoline-2,4-diones with ethanolamine and rearrangement of the reaction products

Antonín Klásek, Filip Křemen, Hana Křemenová, Antonín Lyčka, more

Tetrahedron > 2017 > 73 > 12 > 1583-1593

The reaction of tertiary α-chloroketones with ethanolamine has not been hitherto described in the literature. Herein, we describe the reaction of tertiary 3-chloroquinoline-2,4-diones with ethanolamine to give novel 3-(2-hydroxyethylamino)quinoline-2,4-diones. These compounds provide 3-(2-oxooxazolidin-3-yl)quinoline-2,4(1H,3H)-diones and new compounds with dimeric character after reaction with triphosgene...

article

Hydrosilylation of RN=CH Imino‐Substituted Pyridines without a Catalyst

Miroslav Novák, Hana Hošnová, Libor Dostál, Britta Glowacki, more

Chemistry – A European Journal > 23 > 13 > 3074 - 3083

Treatment of the neutral pyridine‐based ligands L¹–L³, bearing either one or two RN=CH imine moieties {where L¹ and L² are N,N‐chelating ligands 2‐(RN=CH)C₅H₄N (R=Ph (L¹) or R=2,4,6‐Ph₃C₆H₂ (L²)) and L³ is the N,N,N‐chelating ligand 2,6‐(RN=CH)₂C₅H₃N (R=2,6‐iPr₂C₆H₃)}, with HSiCl₃ yielded N→Si‐coordinated silicon(IV) amides 2‐{Cl₃SiN(R)CH₂}C₅H₄N (1, R=Ph; 2, R=2,4,6‐Ph₃C₆H₂) and 2‐{Cl₃SiN(R)CH₂}‐6‐(RN=CH)C...

article

Synthesis of Hydroxy‐Substituted p‐Terphenyls and some Larger Oligophenylenes via Palladium on Charcoal Catalyzed Suzuki‐Miyaura Reaction

Josef Jansa, Tomáš Řezníček, Roman Jambor, Filip Bureš, more

Advanced Synthesis & Catalysis > 359 > 2 > 339 - 350

A ligand‐free heterogeneous palladium on charcoal (Pd/C)‐catalyzed Suzuki‐Miyaura cross‐coupling has been performed. The series of substituted p‐terphenyls were prepared in very good yields without exclusion of air and with low catalyst loadings. Moreover, the developed environmentally benign and scalable protocol enables to use electron poor and sterically hindered boronic acids.

article

Homolytic, Heterolytic, Mesolytic ‐ As You Like It: Steering the Cleavage of a HC(sp³)−C(sp³)H Bond in Bis(1H‐2,1‐benzazaborole) Derivatives

Martin Hejda, Antonín Lyčka, Tomáš Mikysek, Roman Jambor, more

Chemistry – A European Journal > 22 > 43 > 15340 - 15349

A set of (3,3′)‐bis(1‐Ph‐2‐R‐1H‐2,1‐benzazaborole) compounds, in which R=tBu (Bab‐tBu)₂, R=Dipp (Bab‐Dipp)₂ or R=tBu and Dipp (Bab‐Dipp)(Bab‐tBu), was synthesized and fully characterized using ¹H, ¹¹B, ¹³C, and ¹⁵N NMR spectroscopy as well as single‐crystal X‐ray diffraction analysis. The central HC(sp³)−C(sp³)H bond with restricted rotation at the junction of both 1H‐2,1‐benzazaborole rings displayed...

article

Stereochemistry of the reduction of α-chloroketones with sodium borohydride—application to 3-chloroquinoline-2,4-diones

Antonín Klásek, Antonín Lyčka, Filip Křemen, Michal Rouchal

Tetrahedron > 2016 > 72 > 30 > 4490-4497

3-Chloroquinoline-2,4-diones were reduced with sodium borohydride to give syn- and anti-chlorohydrins, the stereochemistry of which was established by NMR spectroscopy. Both stereoisomeric chlorohydrins were reacted with potassium carbonate in methanol. anti-Isomers afforded the corresponding epoxides or rearranged to 3-hydroxy-4-alkylquinolin-2-ones, whereas syn-isomers did not react. However, these...

article

Analytical Characterization of Erythritol Tetranitrate, an Improvised Explosive

Robert Matyáš, Antonín Lyčka, Robert Jirásko, Zdeněk Jakový, more

Journal of Forensic Sciences > 61 > 3 > 759 - 764

Erythritol tetranitrate (ETN), an ester of nitric acid and erythritol, is a solid crystalline explosive with high explosive performance. Although it has never been used in any industrial or military application, it has become one of the most prepared and misused improvise explosives. In this study, several analytical techniques were explored to facilitate analysis in forensic laboratories. FTIR and...

article

Reduction of N‐Nitrosaminoquinolinediones with LiAlH₄ – an Easy Path to New Tricyclic Benzoxadiazocines

Antonín Klásek, Antonín Lyčka, Filip Křemen, Aleš Růžička, more

Helvetica Chimica Acta > 99 > 1 > 50 - 62

3‐Butylaminoquinolinediones (1) react with NaNO₂ in AcOH to give the corresponding N‐nitrosoderivatives (2). The analogous reactions of 4‐hydroxy‐3‐butylaminoquinolinediones (5), prepared by the reduction of 1 with NaBH₄, produce the corresponding nitrosamines (4). The reduction of both 2 and 4 with Zn under different conditions was non‐productive, but the reduction of both compounds with LiAlH₄ at...

article

Reaction of 3‐Hydroxyquinoline‐2,4‐diones with Inorganic Thiocyanates in the Presence of Ammonium or Alkylammonium Ions: the Unexpected Replacement of a Hydroxy Group by an Amino Group

Antonín Klásek, Ondřej Rudolf, Michal Rouchal, Antonín Lyčka

Helvetica Chimica Acta > 98 > 3 > 318 - 335

3‐Hydroxyquinoline‐2,4‐diones react with KSCN in the presence of the NH$\rm{{_{4}^{+}}}$ ions to generate 2,3‐dihydro‐3‐thioxoimidazo[1,5‐c]quinazolin‐5(6H)‐ones, 2,3‐dihydro‐2‐thioxo‐1H‐imidazo[4,5‐c]quinolin‐4(5H)‐ones, and products of molecular rearrangement of the 3‐aminoquinolinedione intermediates. Starting compounds with a benzyl (Bn) group at C(3) afford 3‐aminoquinolinediones, even when only...

article

Synthesis, structure and rearrangement of iodinated imidazo[1,2-c]pyrimidine-5(6H)-ones derived from cytosine

Josef Jansa, Antonín Lyčka, Aleš Růžička, Martin Grepl, more

Tetrahedron > 2015 > 71 > 1 > 27-36

We describe mild and selective iodination of various 8-substituted imidazo[1,2-c]pyrimidine-5(6H)-ones (ethenocytosines). Starting ethenocytosines were obtained by cyclization of 5-halogenocytosines with chloroacetaldehyde or by subsequent Suzuki–Miyaura cross-coupling between 8-iodoimidazo[1,2-c]pyrimidine-5(6H)-one 1d and corresponding arylboronic acids. When imidazo[1,2-c]pyrimidine-5(6H)-one or...

article

Innovation in Study of Physical and Technical Measurements. Czech-Polish Cooperation of Universities / Innowacje Studiów Fizyczne I Techniczne Metody Pomiarowe. Czesko-Polska Współpraca Uniwersytetów

Jan Kříž, Lidmila Hyšplerová, Lucie Trnková, Antonín Lyčka, more

Chemistry-Didactics-Ecology-Metrology > 2014 > 19 > 1-2 > 37-45

In the Faculty of Science (University of Hradec Králové) the innovative program in chemistry for the study specialization Physico-technical Measurements and Computer Technology was developed. The innovation of chemistry filed study has been focused especially on increase in competitiveness and in graduates employment. Design of innovation enables graduates applying for the position of experts in physical...

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NMR (19)
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4,6‐DIAZIDO‐N‐NITRO‐1,3,5‐TRIAZINE‐2‐AMINE (1)
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4-[((E)-1-{2-HYDROXY-5-[(E)-2-(2-CARBOXYPHENYL)-1-DIAZENYL]PHENYL}METHYLIDENE)AMINO]ARYLS (1)
47TI AND 49TI NMR (1)
5-NITROBENZO[C]-2,1-THIAZOL-3-DIAZONIUM (1)
5-[(E)-2-(ARYL)-1-DIAZENYL]-2-HYDROXYBENZOIC ACID (1)
5-[(E)-2-(ARYL)-1-DIAZENYL]QUINOLIN-8-OL (1)
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INFONA - science communication portal

Search results for: Antonín Lyčka

Environmental emissions dispersion modelling, principles and algorithms; cross-border CZ-PL course for master’s students

Lewis Superacidic Tellurenyl Cation‐Induced Electrophilic Activation of an Inert Carborane

Front Cover: Lewis Superacidic Tellurenyl Cation‐Induced Electrophilic Activation of an Inert Carborane (Chem. Eur. J. 59/2021)

Diorganotin Compounds Containing α‐Aminoacidato Schiff Base Ligands Derived from Functionalized 2‐Hydroxy‐5‐(aryldiazenyl)benzaldehyde. Syntheses, Structures and Sensing of Hydrogen Sulfide

Imidazo[1,2‐c]pyrimidin‐5(6H)‐one as a novel core of cyclin‐dependent kinase 2 inhibitors: Synthesis, activity measurement, docking, and quantum mechanical scoring

Organosilicon and ‐germanium Hydrides in Catalyst‐Free Hydrometallation Reactions

Design, synthesis and antitubercular potency of 4-hydroxyquinolin-2(1H)-ones

Spectral Characteristic and Preliminary Anticancer Activity in vitro of Selected Rhodanine‐3‐carboxylic Acids Derivatives

4-Carboxyl-2,6-dinitrophenylazohydroxynaphthalenes tautomerism NMR re-explained

Preparation and characterization of novel double-decker rare-earth phthalocyanines substituted with 5-bromo-2-thienyl groups

Reaction of 3-chloroquinoline-2,4-diones with ethanolamine and rearrangement of the reaction products

Hydrosilylation of RN=CH Imino‐Substituted Pyridines without a Catalyst

Synthesis of Hydroxy‐Substituted p‐Terphenyls and some Larger Oligophenylenes via Palladium on Charcoal Catalyzed Suzuki‐Miyaura Reaction

Homolytic, Heterolytic, Mesolytic ‐ As You Like It: Steering the Cleavage of a HC(sp³)−C(sp³)H Bond in Bis(1H‐2,1‐benzazaborole) Derivatives

Stereochemistry of the reduction of α-chloroketones with sodium borohydride—application to 3-chloroquinoline-2,4-diones

Analytical Characterization of Erythritol Tetranitrate, an Improvised Explosive

Reduction of N‐Nitrosaminoquinolinediones with LiAlH₄ – an Easy Path to New Tricyclic Benzoxadiazocines

Reaction of 3‐Hydroxyquinoline‐2,4‐diones with Inorganic Thiocyanates in the Presence of Ammonium or Alkylammonium Ions: the Unexpected Replacement of a Hydroxy Group by an Amino Group

Synthesis, structure and rearrangement of iodinated imidazo[1,2-c]pyrimidine-5(6H)-ones derived from cytosine

Innovation in Study of Physical and Technical Measurements. Czech-Polish Cooperation of Universities / Innowacje Studiów Fizyczne I Techniczne Metody Pomiarowe. Czesko-Polska Współpraca Uniwersytetów

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