Výsledky vyhledávání - "M. A. Ashirmatov"

Quantum chemical studies of pyrimidin-4-ones

Autor: N. D. Chuvylkin, M. Kh. Mamarakhmonov, L. I. Belen´kii, M. A. Ashirmatov, I. S. Ortikov, B. Zh. Elmuradov, Kh. M. Shakhidoyatov

Publikováno v: Russian Chemical Bulletin. 64:534-539

Quantum chemical calculations of energies, electronic structures, and molecular geometries of 3,5,6-trimethylthieno[2,3-d]pyrimidin-4-one (1), tricyclic 2,3-tri-, 2,3-tetra-, and 2,3-pentamethylene-substituted 5,6-dimethylthieno[2,3-d]pyrimidin-4-one

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::f997bc8973aaa5c96d9c67109f7b006d
https://doi.org/10.1007/s11172-015-0897-3

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Quantum chemical studies of pyrimidin-4-ones 4.* Electronic structure and reactivity of substituted 2-oxo(thioxo)thieno[2,3-d]pyrimidin-4-ones. Mechanism of ipso-substitution of methyl group by nitro group

Autor: B. Zh. Elmuradov, Leonid I. Belen’kii, A. Kodirov, M. A. Ashirmatov, M. Kh. Mamarahmonov, Kh. M. Shakhidoyatov, N. D. Chuvylkin, I. S. Ortikov

Publikováno v: Russian Chemical Bulletin. 63:1986-1992

The quantum chemical calculations of the energies, electronic structures, and geometries for the products and intermediates of the ipso-nitration of 5,6-dimethyl-substituted 2-oxo- and 2-thioxothieno[2,3-d]pyrimidin-4-ones, as well as 6-methyl-5-nitr

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::bb5360c471abc0e631fc91b02a72852b
https://doi.org/10.1007/s11172-014-0689-1

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Quantum chemical studies of pyrimidin-4-ones 3. 2-Oxo(thioxo, selenoxo)pyrimidin-4-ones and 5,6-dimethyl-2-oxo(thioxo)thieno[2,3-d]pyrimidin-4-ones

Autor: N. D. Chuvylkin, M. Kh. Mamarakhmonov, Kh. M. Shakhidoyatov, Leonid I. Belen’kii, M. A. Ashirmatov

Publikováno v: Russian Chemical Bulletin. 63:350-354

Quantum chemical calculations for 2-oxo-, 2-thioxo-, and 2-selenoxopyrimidin-4-ones, as well as for 5,6-dimethyl-2-oxo- and 5,6-dimethyl-2-thioxothieno[2,3-d]pyrimidin-4-ones, were carried out at the HF and DFT levels. An analysis of the relative ene

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::4c5838acb373551a0d8e5272b7dba88f
https://doi.org/10.1007/s11172-014-0436-7

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[Untitled]

Autor: M. Kh. Mamarakhmonov, Kh. M. Shakhidoyatov, M. A. Ashirmatov

Publikováno v: Chemistry of Heterocyclic Compounds. 37:993-996

Semiempirical quantum-chemical calculations have been carried out of the molecules of 2-oxopyrimidinones-4. The geometry and electronic structures and the stabilities of the tautomeric forms have been analyzed.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::7f5881f0e84599ac5317a88113353e9a
https://doi.org/10.1023/a:1012791718619

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Quantum-chemical investigation of some features of the interconversions of the gossypol molecule

Autor: M. A. Ashirmatov, N. D. Abdullaev

Publikováno v: Chemistry of Natural Compounds. 32:513-522

The electron conformations and tautomeric transformations of the gossypol molecule have been investigated by the MO LCAO method in the AMI approximation. On the basis of an analysis of the electronic structures of 24 model molecules, each forming, as

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::829221ee9b9f9fca0acdb03b02333e44
https://doi.org/10.1007/bf01372602

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Oxidative cyclocondensation of thio(seleno)-amides and ureas 1. 2-thioxo-4-quinazolone

Autor: V. P. Bruskov, Kh. M. Shakhidoyatov, M. A. Ashirmatov, N. I. Mukarramov, B. A. Urakov

Publikováno v: Chemistry of Heterocyclic Compounds. 32:728-731

It has been found for the first time that 2-thioxo-4-quinazolone in the presence of acid catalysts in dimethyl sulfoxide is converted to8H,15H-1, 2, 4-thiadiazolo[3, 2-b:5, 4-b′]diquinazoline-8,15-done. The reaction proceeds via oxidative cyclocond

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::b7d34c932fc7a130280e5ab1509363fa
https://doi.org/10.1007/bf01164875

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Quantum chemical investigation of the effect of cation size on the course of the methylation of 2,4-dioxoquinazoline salts

Autor: Kh. M. Shakhidoyatov, M. A. Ashirmatov, B. A. Urakov

Publikováno v: Chemistry of Heterocyclic Compounds. 32:708-711

The effect of cation size on the dual reactivity of the lithium, sodium, and potassium salts of 2, 4-dioxoquinazolines in liquid and solid phase methylation reactions has been studied. The results obtained were confirmed by data of quantum chemical c

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::c65ff30e8f48cbffacff4929e89bbff0
https://doi.org/10.1007/bf01164871

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MNDO, AM1 and PM3 calculations in the study of the energy and structure of quinazolone tautomers

Autor: Kh. M. Shakhidoyatov, M. A. Ashirmatov

Publikováno v: Chemistry of Heterocyclic Compounds. 29:1065-1069

MNDO, AM1, and PM3 calculations were used to study the tautomeric forms of quinazolones. The relative energy of the tautomers closest to the experimental value was obtained using the AM1 and PM3 methods. The keto-enol tautomeric equilibrium of quinaz

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::8da3333bd2c8c24c57a547a50b3539c6
https://doi.org/10.1007/bf00534394

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