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Your search keyword '"Georgyi Koidan"' showing total 41 results
Start Over Author "Georgyi Koidan" Topic general medicine
41 results on '"Georgyi Koidan"'

2. ChemInform Abstract: Facile Synthesis of C-Phosphanylformamidines via a Carbene Pathway

Author

Aleksandr N. Kostyuk, Georgyi Koidan, Anatoliy Marchenko, Aleksandr Savateev, and Anastasiya Hurieva

Subjects
chemistry.chemical_classification, chemistry.chemical_compound, Deprotonation, chemistry, Nitrogen atom, Organic chemistry, General Medicine, Medicinal chemistry, Carbene, Alkyl
Abstract

A direct synthetic approach to C-phosphanyl-N,N-dialkyl-N′-aryl(alkyl)-formamidines was developed. It was shown that phosphorylation of the formamidines proceeds at the nitrogen atom affording N-phosphanylformamidinium salts. Upon deprotonation, these salts gave C-phosphanylformamidines via formation of carbenes followed by a 1,2-phosphorus shift.

Published
2014
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9. ChemInform Abstract: 4-Phosphorylated 1,2-Disubstituted Imidazoles

Author

Aleksandr N. Kostyuk, A. A. Yurchenko, A. P. Marchenko, Georgyi Koidan, Anastasiia N. Huryeva, Alexander M. Pinchuk, and Evgenij V. Zarudnitskii

Subjects
Chemistry, Phosphorylation, Organic chemistry, General Medicine
Abstract

A facile route to 4-phosphorylated imidazoles starting from readily available 5-diamidoselenophosphoryl-imidazoles (VI) is developed.

Published
2010
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12. ChemInform Abstract: Reaction of Nucleophilic Polyhalogenalkylation in Two- and Three-Component Systems

Author

A. P. Marchenko, Alexander M. Pinchuk, and Georgyi Koidan

Subjects
Nucleophile, chemistry, Component (thermodynamics), Phosphorus, chemistry.chemical_element, General Medicine, Medicinal chemistry
Abstract

The halophilic reactions of the derivatives of PIII R3 P (R = R2N, Alk, Ar) with CCl4, having preparative signifi-cance, are studied thoroughly. As far as the compounds of R2PHlg type are concerned, at the beginning of our re-searches there was was an opinion that the interaction of R2PHlg with CC14 cannot be possible because of the low nucleophility of phosphorus. We determined for the first time that diamidochlorophosphites 1 react with CC14 at the temperature 20°C and form the compounds 2, 3.1

Published
1990
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23. ChemInform Abstract: METHYLATION OF THE PHOSPHORYL GROUP WITH METHYL IODIDE

Author

Alexandr M. Pinchuk, A. P. Marchenko, and Georgyi Koidan

Subjects
chemistry.chemical_classification, Tris, Hexamethyldisiloxane, Inorganic chemistry, Iodide, General Medicine, Methylation, Medicinal chemistry, NMR spectra database, chemistry.chemical_compound, chemistry, Phosphorus-31 NMR spectroscopy, Phosphoric acid, Methyl iodide
Abstract

The authors have established that hexaalkyltriamidophosphazo groups are unusually strong electron-donor substituents at P /SUP III/ , causing the extremely high basicity of such compounds. This paper performs methylation of tris (tris (N,N-dimethylamido) phosphazo) phosphate and tris (tris (N,N-dimethylamido) phosphazo) methoxyphosphonium iodide (I) using methyl oxide. The NMR spectra were recorded on a Bruker WP-20 spectrometer, and hexamethyldisiloxane and 85% H/sub 3/PO/sub 4/ were used as the standard.

Published
1985
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