Zobrazeno 1 - 10
of 17
pro vyhledávání: '"G. M. Kheifets"'
Publikováno v:
Russian Journal of Organic Chemistry. 42:580-590
5-Fluoro-4-hydroxy-2-methoxypyrimidine exists in a solution as two oxo tautomers with the conjugated and isolated double bonds in the ring. The latter tautomer has a zwitterionic structure, and it dominates in water and trifluoroethanol. 5-Fluoro-4-h
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1d4155d387f78aa6efe014d557e297db
https://doi.org/10.1134/s1070428006040166
https://doi.org/10.1134/s1070428006040166
Autor:
G. M. Kheifets, V. A. Gindin
Publikováno v:
Russian Journal of Organic Chemistry. 40:560-566
According to the data of UV and NMR spectroscopy, 1- and 3-methylpyrimidin-4-ones and their 5-fluoro-substituted analogs in water and DMSO in the presence of bases undergo ring opening with formation of β-formylaminoacrylamide derivatives. The proce
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::724eb7040ca13facec7ab9514ce66d3c
https://doi.org/10.1023/b:rujo.0000036080.69879.b2
https://doi.org/10.1023/b:rujo.0000036080.69879.b2
Publikováno v:
Russian Journal of Organic Chemistry. 40:104-113
Rate constants for substitution of the 2-methylsulfanyl group in 1- and 3-methyl-2-methylsulfanyl-pyrimidin-4-ones and their 5-fluoro analogs were measured in the reaction with butylamine, alkaline hydrolysis, and methanolysis. The rate of substituti
Externí odkaz:
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https://doi.org/10.1023/b:rujo.0000034918.26019.44
https://doi.org/10.1023/b:rujo.0000034918.26019.44
Publikováno v:
Russian Journal of Organic Chemistry. 40:97-103
Hydrogen atom in position 6of 5-fluoro-1-methylpyrimidin-4(1H)-one and its 2-methylsulfanyl, 2methoxy and 2-butylamino derivatives is readily replaced by deuterium in 90% methanol-d4 at ~20°C under conditions of base catalysis. The rate of H-D excha
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b6cb096ffc3c4258a8c5b531c76c55f0
https://doi.org/10.1023/b:rujo.0000034917.31926.78
https://doi.org/10.1023/b:rujo.0000034917.31926.78
Publikováno v:
Pharmaceutical Chemistry Journal. 14:517-523
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e3532dae4e531943b29723cd61553259
https://doi.org/10.1007/bf00765831
https://doi.org/10.1007/bf00765831
Autor:
G. M. Kheifets, S. A. Shelkovnikov, V. A. Shigalevskii, N. V. Martyushina, D. Yu. Fedorov, G. G. Solomatin, N. V. Khromov-Borisov
Publikováno v:
Pharmaceutical Chemistry Journal. 16:524-530
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0476ab3565a732e22e52382dd1594732
https://doi.org/10.1007/bf00761544
https://doi.org/10.1007/bf00761544
Autor:
Anatolii I Kol'tsov, G M Kheifets
Publikováno v:
Russian Chemical Reviews. 40:773-788
The review considers methods for the determination of tautomeric composition from NMR spectra and gives a systematic account of the results of studies on keto–enol tautomerism. The bibliography includes 160 references.
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https://explore.openaire.eu/search/publication?articleId=doi_________::b0c418353f9e5219024d1150dceb8506
https://doi.org/10.1070/rc1971v040n09abeh001969
https://doi.org/10.1070/rc1971v040n09abeh001969
Publikováno v:
Tetrahedron. 23:1197-1209
PMR spectra of 4,6-dihydroxypirimidine and its 2- and 5-substituted derivatives have been compared with the spectra of their O- and N-methyl derivatives of fixed structures, corresponding to possible tautomeric forms. It was found that in dimethyl su
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a7bed902e27cf39c53abae7b19cf228a
https://doi.org/10.1016/0040-4020(67)85070-1
https://doi.org/10.1016/0040-4020(67)85070-1
Autor:
G M Kheifets, Anatolii I Kol'tsov
Publikováno v:
Russian Chemical Reviews. 41:452-467
The present review describes the contribution of NMR to the study of prototropic tautomerism of various types, with the exception of keto-enol tautomerism, which was dealt with in an earlier review. The bibliography contains 221 references.
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https://explore.openaire.eu/search/publication?articleId=doi_________::de847faa54748fa1becc2f291ed5d769
https://doi.org/10.1070/rc1972v041n05abeh002068
https://doi.org/10.1070/rc1972v041n05abeh002068
Autor:
G. M. Kheifets
Publikováno v:
Chemischer Informationsdienst. 10
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::45ff70522c5bda0a74d58bbe03fbc169
https://doi.org/10.1002/chin.197951116
https://doi.org/10.1002/chin.197951116