Zobrazeno 1 - 10
of 125
pro vyhledávání: '"O. P. Shestak"'
Autor:
O. I. Shestak
Publikováno v:
Высшее образование в России, Vol 0, Iss 3, Pp 108-113 (2022)
The article presents the system model of education quality management at higher education institution. The model is based on the marketing approach.
Externí odkaz:
https://doaj.org/article/d25786cda3434e82a30fc9deab3faec7
Publikováno v:
Russian Chemical Bulletin. 71:2241-2254
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8de21f1a0a9bdcf81158147e3082e693
https://doi.org/10.1007/s11172-022-3652-6
https://doi.org/10.1007/s11172-022-3652-6
Publikováno v:
Russian Chemical Bulletin. 70:1584-1598
The reaction mechanisms of cyclic 1,3-diketones with trialkyl orthoformates and trimethyl orthoacetate in the absence of activators were theoretically and experimentally studied. The reactions proceed via C-C-coupling of the ionized forms of the reac
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::03e01a1d93c1a9f9f3dc2be76c8f374e
https://doi.org/10.1007/s11172-021-3255-7
https://doi.org/10.1007/s11172-021-3255-7
Publikováno v:
Russian Chemical Bulletin. 70:792-804
The regiochemistry of direct amination of 2-hydroxynaphthazarin (naphthopurpurin) and 2,7-dihydroxynaphthazarin (mompain), sea urchin pigments, and their O-methyl ethers by the action of ammonia solutions in H2O and MeOH under mild conditions was stu
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::eface3259e7750b03475833f8a888798
https://doi.org/10.1007/s11172-021-3152-0
https://doi.org/10.1007/s11172-021-3152-0
Publikováno v:
Nauka i Tehnika, Vol 0, Iss 4, Pp 70-74 (2011)
Development, as a type of entrepreneurial activity, has appeared rather recently on the market of building real estate in Belarus but this phenomena has already proved itself actively in the implementation of large-scale projects pertaining to constr
Externí odkaz:
https://doaj.org/article/f74c73d61fc441e184a4920af0c53637
Autor:
Sergey A. Fedoreyev, O. P. Shestak, Jin Han, N. N. Balaneva, Vyacheslav L. Novikov, Valentin A. Stonik, Hyoung Kyu Kim, Natalia P. Mishchenko, Elena A. Vasileva, Chang Shin Yoon
Publikováno v:
Molecular & Cellular Toxicology. 15:407-414
Echinochrome A (6-ethyl-2,3,5,7,8-pen-tahydroxy-1,4-naphthoquinone) is a common naphthoquinone pigment found in the shells, spines, and coelomic fluid of sea urchins. We previously reported that echinochrome A has a cardioprotective function as an an
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::edbac389efc2a5d8650ad9789025eaa2
https://doi.org/10.1007/s13273-019-0044-6
https://doi.org/10.1007/s13273-019-0044-6
Publikováno v:
Russian Chemical Bulletin. 68:55-63
Trimethyl orthoacetate was found to be a convenient reagent for methylation of the β-OH groups of (poly)hydroxynaphthazarins. The substrates bearing one β-OH group react with MeC(OMe)3 to give the corresponding methoxy derivatives in 79–89% yield
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8b405239f7582183b3811b56a25f3286
https://doi.org/10.1007/s11172-019-2415-5
https://doi.org/10.1007/s11172-019-2415-5
Autor:
Elena A. Vasileva, Artyukov Aleksandr A, S. A. Fedoreev, O. P. Shestak, Natalia P. Mishchenko, Valery P. Glazunov, Vyacheslav L. Novikov
Publikováno v:
Russian Chemical Bulletin. 67:282-290
The nondestructive oxidation of 7-ethyl-2,3,5,6,8-pentahydroxy-1,4-naphthoquinone by atmospheric oxygen in the ground (triplet 3Σg–) and excited (singlet 1Δg) states in different solvents (acetone, dioxane, ethanol, aqueous ethanol, water) at roo
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::12826e76128f74aaa24b9fac246d9786
https://doi.org/10.1007/s11172-018-2071-1
https://doi.org/10.1007/s11172-018-2071-1
Publikováno v:
Russian Chemical Bulletin. 65:993-1003
Under the drastic conditions of Zahn—Ochwat cycloacylation of 2-chloroand 2,3-dichlorohydroquinones with dichloromaleic anhydride (a melt of anhydrous AlCl3 and NaCl, 185—195 °C), the substrates undergo various degrees of disproportionation, whi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::afad71fc9b9bfd967d7282f4440b8a9a
https://doi.org/10.1007/s11172-016-1402-3
https://doi.org/10.1007/s11172-016-1402-3
Publikováno v:
Chemistry of Natural Compounds. 52:213-217
The sea-urchin metabolite spinochrome D (1) was synthesized in 58% overall yield via oxidation of 2,3-dichloronaphthazarin (13) into 2-hydroxy-6,7-dichloronaphthazarin (14), O-methylation of 14, nucleophilic substitution by MeO groups of the Cl atoms
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2e7b32f89b22b0fb1458700fa949f3ac
https://doi.org/10.1007/s10600-016-1597-4
https://doi.org/10.1007/s10600-016-1597-4