Josef Kuthan

Ricardo Prague (Czechia)

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Stanislav Böhm

University of Chemistry and Technology, Prague

V. Skála

University of Chemistry and Technology, Prague

Jaroslav Paleček

University of Chemistry and Technology, Prague

Jiří Krechl

University of Chemistry and Technology, Prague

Bohumil Kratochvíl

University of Chemistry and Technology, Prague

PŠ

Pavel Šebek

Institute of Entomology

L. Musil

Czech Academy of Sciences

S. Nešpůrek

University of West Bohemia

Richard Kubík

Ricardo Prague (Czechia)

J. Volke

Czech Academy of Sciences, J. Heyrovský Institute of Physical Chemistry

Cooperative Institutions

University of Chemistry and Technology, Prague

Institute of Chemical Technology

Czech Academy of Sciences

Charles University

Czech Academy of Sciences, Institute of Organic Chemistry and Biochemistry

Ricardo Prague (Czechia)

Czech Academy of Sciences, J. Heyrovský Institute of Physical Chemistry

Czech Technical University in Prague

Czech Academy of Sciences, Institute of Macromolecular Chemistry

Czech Academy of Sciences, Institute of Microbiology

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ChemInform Abstract: Photocolouration of 2,4,4,6‐Tetraaryl‐4H‐thiopyrans: A Semiempirical Quantum Chemical Study.

ChemInform (1994)

S. BOEHM Pavel Šebek S. Nešpůrek Josef Kuthan

Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” option.

Quantum chemical

10.1002/chin.199441019

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Citations (1)

Spectroscopic properties of 1-substituted 3,5-dicyano-2,4,4,6-tetramethyl-1,4-dihydropyridines

Collection of Czechoslovak Chemical Communications (1974)

Josef Kuthan Jaroslav Paleček

10.1135/cccc19743711

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Citations (7)

On dihydropyridines. XX. Reactions of organomagnesium and organolithium reagents with 3,5-dicyano-2,6-dimethylpyridine

Collection of Czechoslovak Chemical Communications (1969)

Jiřı́ Paleček K. Vondra Josef Kuthan

10.1135/cccc19692991

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Citations (10)

Simple amidinium carboxylates - An MO treatment of molecular geometry and electronic structure

Collection of Czechoslovak Chemical Communications (1989)

Jiří Krechl Stanislav Böhm Svatava Smrčková Josef Kuthan

Carboxylates of amidines ( I, II ), substituted guanidine ( III ) and iso(thio)ureas ( IV, V ) were prepared. Nonempirical quantum chemical treatment of the electronic structure of simple compounds I-V , based on total molecular geometry optimization, their preparation and physico-chemical data are reported. Interaction between the two amidinium nitrogens and carboxylate oxygens is mediated by hydrogen bonds and alternation of charge distribution.

Guanidine

Carboxylate

Thio-

Molecular geometry

Quantum chemical

Atomic charge

10.1135/cccc19890673

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Citations (13)

CCDC 185125: Experimental Crystal Structure Determination

The Cambridge Structural Database (2003)

J. Kroulı́k Jan Čejka Stanislav Böhm Pavel Šebek S. Nešpůrek

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

Crystal (programming language)

10.5517/cc66mss

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Citations (0)

ChemInform Abstract: DIHYDROPYRIDINES PART 28, A PPP STUDY OF THE ELECTRONIC SPECTRA OF 3,5‐DICYANODIHYDROPYRIDINES AND CORRESPONDING ENAMINONITRILES

Chemischer Informationsdienst (1974)

Josef Kuthan V. Skála L. Musil

10.1002/chin.197408080

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Citations (0)

Quantum chemical study of dissociation of meta and para substituted benzoic acids in π-electron approximation

Collection of Czechoslovak Chemical Communications (1978)

Josef Kuthan Iván Daniel V. Skála

Quantum chemical

Quantum Chemistry

Benzoic acid

10.1135/cccc19780447

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Citations (10)

Zur N‐Alkylierung von 1,4‐Dihydropyridinderivaten

Zeitschrift für Chemie (1974)

Jaroslav Paleček Josef Kuthan

10.1002/zfch.19740140807

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Citations (4)

Reactions of 2,4,4,6-Tetraaryl-4H-thiopyrans with Chlorine: An Unusual Reaction Route

Collection of Czechoslovak Chemical Communications (1994)

Pavel Šebek J. Kroulı́k Petr Sedmera Vladimı́r Havlı́ček Josef Kuthan

2,4,4,6-Tetraaryl-4 H -thiopyrans Ia - Ig react smoothly with carbon disulfide solution of chlorine already at 0 °C yielding the corresponding 3,5-dichloro derivatives IIa - IIg . With longer reaction time and temperature raised to 20 °C, the 4 H -thiopyrans Ia - Ie gave exclusively the trichloro derivatives IIIa - IIIe whereas If and Ig underwent a nonselective chlorination leading to multicomponent mixtures of products. Isolation of sulfoxides IVa and IVe from the chlorination of Ia and Ie (upon hydrolysis of the reaction mixture) allowed us to formulate the reaction mechanism for the formation of compounds type III . 1 H, 13 C NMR, and mass spectra of the prepared compounds are discussed in detail.

Carbon disulfide

Chlorine atom

Reaction conditions

10.1135/cccc19942269

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Citations (4)

Electrophilic 3,5-Substitution of 2,4,4,6-Tetraphenyl-4H-pyran and Some of Its 1-Heteroanalogues

Collection of Czechoslovak Chemical Communications (1992)

Marián Schwarz Pavel Šebek Josef Kuthan

The reaction of dibromine with the heterocycles I-IV gives corresponding 3,5-dibromo derivatives, while the less selective reactions with dichlorine afforded 3,5-dichloro derivative XII only in the case of 4 H -thiopyran IV and trichloro derivative of the probable formula XIII in the case of 1,4-dihydropyridine II . Dichloro derivative IX was obtained on reaction of phosphorus pentachloride with substrate I . Nitration of compounds I-IV gives 3,5-dinitroderivatives XV-XVIII , but mononitro derivatives XIX and XX were also obtained. Iodination of compounds II-IV with di-iodine was unsuccessful.

Phosphorus pentachloride

Electrophilic substitution

Derivative (finance)

Electrophilic aromatic substitution

Pyran

10.1135/cccc19920546

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Citations (11)