Zobrazeno 1 - 10 of 25 pro vyhledávání: '"Jiří Klicnar"'
1
Synthesis of Ring-Substituted Phenyl Hydrazinecarboxylates and Study of Their Protonation in Dimethyl Sulfoxide Solutions
Autor: Petr Vlasák, Jiří Klicnar, Patrik Pařík, Jaromír Mindl
Publikováno v: Collection of Czechoslovak Chemical Communications. 63:793-802
The pKa values of nineteen phenyl hydrazinecarboxylate hydrochlorides R-C6H4OCONHNH2·HCl (R = H, 3- and 4-Cl, 3- and 4-O2N, 4-Me) and their 1-methyl or 2-methyl derivatives were determined by potentiometric titration with tetrabutylammonium hydroxid
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::341d58b6d6d168c0a2d5ebb3b0c05d3c
https://doi.org/10.1135/cccc19980793
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2
Structure of Reaction Products of Some Substituted Quinoxaline N-Oxides with Carbanions
Autor: Jiří Klicnar, Jaromír Toman, Ivana Srovnalová, Jaromír Mindl, Antonín Lyčka, Miloš Koníček
Publikováno v: Collection of Czechoslovak Chemical Communications. 59:2493-2500
1,2,3-Triazolo[1,5-a]- (II) and 1,2,4-triazolo[4,3-a]quinoxaline 5-oxide (III) react with the carbanions of β-diketones and β-keto esters to give enaminones in the same way as their tetrazolo analogue. The difference in mechanism of reactions of th
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::d478f1e89e2f0df172b25fbcad58096d
https://doi.org/10.1135/cccc19942493
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3
The Crystal and Molecular Structure of Charge-Transfer Complex of Azo Dyestuff 5-(4-Chloro-2-nitrophenyl)-azo-6-hydroxy-1-ethyl-3-cyano-4-methyl-2-pyridone with Naphthalene
Autor: Bohumil Kratochvíl, Jan Ondráček, Jiří Klicnar, Josef Přikryl, Jaroslav Maixner, Karel Huml
Publikováno v: Collection of Czechoslovak Chemical Communications. 58:2121-2127
The title charge-transfer complex crystallizes in the ratio of two molecules of azo dyestuff to one molecule of naphthalene. The crystals are triclinic, space group P1, lattice parameters a = 7.953(1), b = 11.608(2), c = 11.717(2) Å, α = 101.89(2),
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::2625b2ea59b5767d855453b659686164
https://doi.org/10.1135/cccc19932121
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6
Kinetics of reaction of 1,2-diaminobenzene with phenylglyoxal
Autor: Jaromír Mindl, Jiří Klicnar, Vojeslav Štěrba
Publikováno v: Collection of Czechoslovak Chemical Communications. 55:1216-1222
The cyclization reaction kinetics of phenylglyoxal monohydrate with 1,2-diaminobenzene have been studied in formate, acetate, and phosphate buffers. At high pH values and low buffer concentrations the rate-limiting step consists in the protonation of
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::6157b483ca460a35e18e56f4e793ce62
https://doi.org/10.1135/cccc19901216
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7
Studies in quinoxaline series. Part 18. Structure of products of a new reaction of tetrazolo[1,5-a]quinoxaline 5-oxide with carbanions. X-Ray molecular structure of 4-acetyl-4-methyl-3b,4-dihydroazirino[1,2-a]tetrazolo-[5,1-c]quinoxaline
Autor: Karel Huml, Jiří Klicnar, Jaromír Toman, Jiří Ječný, Antonín Lyčka, J. Hašek
Publikováno v: J. Chem. Soc., Perkin Trans. 1. :3049-3052
Tetrazolo[1,5-a]quinoxaline-5-oxide 4 reacts with the carbanions of β-diketones and β-keto esters to give enaminoketones and enamino esters, respectively. The N-oxide 4 reacts with 3-methyl- and 3-ethyl-pentane-2,4-dione under similar conditions to
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::bdf90afb1d36ddec1eed7e06025823ef
https://doi.org/10.1039/p19900003049
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8
Synthesis and properties of some derivatives of 3,4-dihydro-3-oxo-2-quinoalinylacetic acid
Autor: Jiří Klicnar, Jaromír Toman
Publikováno v: Collection of Czechoslovak Chemical Communications. 49:976-983
The paper describes opening of isoxazole ring with 1,2-diaminobenzene leading to 2-cyanomethylene-3-oxo-1,2,3,4-tetrahydroquinoxaline and preparation of its derivatives. Synthesis have been studied of substituted 3,4-dihydro-3-oxo-quinoxaline-oxides,
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::af8acbfaf51510b3a45df8284d8dcc2b
https://doi.org/10.1135/cccc19840976
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10
Kinetics and mechanism of alkaline hydrolysis of (E)-O-(N-4-nitrophenylcarbamoyl)benzaldoximes in 30% aqueous ethanol
Autor: Jiří Klicnar, František Radonský, Miroslav Večeřa, Jaromír Mindl
Publikováno v: Collection of Czechoslovak Chemical Communications. 42:3316-3324
Alkaline hydrolysis of (Z)-O-(N-4-nitrophenylcarbamoyl)benzaldoximes (I), the configuration of which was verified by IR spectra, produces a mixture of Z and E-benzaldoximates II and III, benzonitrile IV, and 4-nitrophenylcarbamate ion (V). In subsequ
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8bc8fc99346a13ef46aa1b452bb9c816
https://doi.org/10.1135/cccc19773316
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