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Your search keyword '"Keglevich, Gyorgy"' showing total 25 results
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25 results on '"Keglevich, Gyorgy"'

1. Green Chemical Tools in Organophosphorus Chemistry-Organophosphorus Tools in Green Chemistry.

Author

Keglevich, Gyorgy, Grun, Alajos, Balint, Erika, Kiss, Nora Zs., Kovacs, Rita, Molnar, Istvan G., Blastik, Zsofia, Toth, R. Viola, Fehervari, Andras, and Csontos, Istvan

Subjects
*SUSTAINABLE chemistry, *ORGANOPHOSPHORUS compounds, *ESTERIFICATION, *ALKYLATION, *RING formation (Chemistry), *ADDITION reactions, *FRAGMENTATION reactions, *CONDENSATION, *IONIC liquids, *CATALYSIS, *TRANSITION metal complexes
Abstract

A variety of reactions including esterifications, alkylations, additions, cycloadditions, fragmentations, and condensations were carried out under microwave MW-assisted and solventless conditions, occasionally in ionic liquids (ILs). In a few cases, MW was synergic with phase transfer catalysis or could substitute it. A variety of P(III) ligands were developed and converted to Pt(II) complexes that can be used as catalysts. Finally, phosphorylations and the Kabachnik-Fields reaction were monitored and optimized by an on-line method, in situ Fourier transform IR spectroscopy. [ABSTRACT FROM AUTHOR]

Published
2011
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2. Monitoring the Phosphorylation of Phenol Derivatives with Diethyl Chlorophosphate in Liquid-Liquid and Solid-Liquid Phase by In Situ Fourier Transform Infrared Spectroscopy, Part II.

Author

Keglevich, Gyorgy, Puskás, Reka Eszter, Grün, Alajos, Csontos, István, and Greiner, István

Subjects
*CHLOROPHENOLS, *NITROPHENOLS, *LIQUID-liquid interfaces, *SOLID-liquid interfaces, *FOURIER transform infrared spectroscopy
Abstract

The reaction of 4-chlorophenol and 4-nitrophenol with diethyl chlorophosphate carried out in a liquid-liquid and solid-liquid two phase system, respectively, was monitored by in situ Fourier transform IR spectroscopy. [ABSTRACT FROM AUTHOR]

Published
2010
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3. 1-(2,4,6-tri-tert-butylphenyl)-3-methylphosphole: A phosphole with a significantly flattened...

Author

Keglevich, Gyorgy, Bocskei, Zsolt, Keserü, György Miklós, Újszászy, Kálmán, and Quin, Louis D.

Subjects
*PHOSPHORUS compounds, *CHEMICAL structure
Abstract

Presents a single-crystal X-ray analysis of the phosphorus compound, 1-(2,4,6-tri-tert-butylphenyl)-3-methylphosphole. Physical and chemical properties of the compound; Synthesis of the compound; Report on phosphindole; Effect of the phosphorus-substituent on the geometry of the phosphorus pyramid.

Published
1997
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4. Phospholes with reduced pyramidal character from steric crowding. 2. Photoelectron spectral...

Author

Nyulaszi, Laszlo and Keglevich, Gyorgy

Subjects
*PHOTOELECTRON spectroscopy
Abstract

Focuses on the exploration of photoelectron spectroscopy as a tool to measure the flattening of the phosphorus pyramid in a phosphole. Results of the calculations of the Koopmans ionization energies at the Hartee-Fock 6-31G* level for 1-methylphospholane; Attribution of the difference in values to electron delocalization in the phosphole.

Published
1996
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5. Phospholes with reduced pyramidal character from steric crowding. 1. Synthesis and NMR...

Author

Quin, Louis D. and Keglevich, Gyorgy

Subjects
*PHOSPHORUS, *STERIC hindrance
Abstract

Focuses on the synthesis of 1-(2,4-di-tert-butyl-6-methylphenyl)-3-methylphosphole by dehydrohalogenation of the corresponding 3,4-dibromophospholane. Possibility that the steric congestion would cause some flattening of the phosphorus pyramid; Increase in electron delocalization.

Published
1996
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6. Platinum(II) Complexes of P(III)-Heterocycles.

Author

Keglevich, Gyorgy, Kerenyi, Andrea, Kovacs, Viktoria, Ujj, Viktoria, Kollar, Laszlo, and Kortvelyesi, Tamas

Subjects
*TRANSITION metal complexes, *HETEROCYCLIC compounds, *LIGANDS (Chemistry), *COMPLEX compounds synthesis, *ORGANOPHOSPHORUS compounds, *PHENYL compounds, *CYCLIC compounds, *CHELATES, *HYDROFORMYLATION
Abstract

Different types of platinum(II) complexes incorporating heterocyclic P-ligands were synthesized. [ABSTRACT FROM AUTHOR]

Published
2011
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7. Platinum complexes of phospholes with reduced pyramidal character from steric crowding.

Author

Csok, Zsolt and Keglevich, Gyorgy

Subjects
*PLATINUM, *INORGANIC chemistry, *BIOSYNTHESIS
Abstract

Presents a study on the synthesis of platinum complexes of phospholes with reduced pyramidal character from steric crowding. Selective formation of the complexes; Hydrogen chemical shifts of coordinated and noncoordinated ligands; Pyramidal arrangement of the substituents of the coordinated phosphorus.

Published
1999
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8. Microwave-Assisted Esterification of Phosphinic Acids by Alcohols, Phenols, and Alkyl Halogenides.

Author

Keglevich, Gyorgy, Kiss, Nora Zs., Balint, Erika, Jablonkai, Erzsebet, Grun, Alajos, Milen, Matyas, Frigyes, David, and Greiner, Istvan

Subjects
*MICROWAVES, *ESTERIFICATION, *PHOSPHINIC acid, *ALCOHOLS (Chemical class), *PHENOLS, *HALIDES, *CYCLIC compounds, *TEMPERATURE effect, *HETEROCYCLIC compounds, *CATALYSIS, *SUSTAINABLE chemistry
Abstract

Cyclic phosphinic acids undergo direct esterification with alcohols at ca. 200°C under microwave conditions. [ABSTRACT FROM AUTHOR]

Published
2011
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22. Phase Transfer Catalysis in Phosphorus Chemistry.

Author

Ilia, Gheorghe, Macarie, Lavinia, Balint, Erika, and Keglevich, Gyorgy

Subjects
*PHASE-transfer catalysis, *PHOSPHORUS compounds, *PHOSPHORYLATION, *ORGANIC chemistry, *PHENOLS, *NUCLEOPHILIC reactions, *CHEMICAL engineering
Abstract

Phase-transfer catalysis (PTC) has been widely used for the synthesis of organic compounds for more than three decades. The scope and mechanistic features of PTC have been the aim of numerous studies. This review focuses on the application of phase transfer catalysis in synthesis of phosphorus compounds. [ABSTRACT FROM AUTHOR]

Published
2011
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23. Resolution of P-Heterocycles with Tartaric Acid Derivatives.

Author

Ujj, Viktoria, Bagi, Peter, Laki, Andrea, Fogassy, Elemer, and Keglevich, Gyorgy

Subjects
*HETEROCYCLIC compounds, *TARTARIC acid, *ORGANOPHOSPHORUS compounds, *OXIDES, *ORGANIC chemistry, *OPTICAL resolution
Abstract

3-Phospholene 1-oxides were efficiently resolved by tartaric acid derivatives. [ABSTRACT FROM AUTHOR]

Published
2011
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