Zobrazeno 1 - 10
of 42
pro vyhledávání: '"Wieslaw Z. Antkowiak"'
Autor:
Wieslaw Z. Antkowiak, Adam Sobczak
Publikováno v:
Synthetic Communications. 35:2993-3001
The reaction of diethyl aminomethylenemalonate with ethyl acetoacetate proceeded, when catalyzed by anhydrous hydrogen chloride, toward a respectively substituted α‐ instead of γ‐pyridone derivative formation, contrary to the literature report.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::bbdfce7690eb242633f75d45180d050a
https://doi.org/10.1080/00397910500278545
https://doi.org/10.1080/00397910500278545
Autor:
Wieslaw Z. Antkowiak, Adam J. Sobczak
Publikováno v:
Tetrahedron. 57:2799-2805
In an aprotic medium, such as THF, Et 2 O or CH 2 Cl 2 , the reaction of 1,10-phenanthroline-5,6-dione with diazomethane gave 5,6-methylenedioxy-1,10-phenanthroline as the only product. In contrast, in a protic solvent, such as 2-propanol or ethanol,
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4d200e7aecaa0b651e1db10ee272486d
https://doi.org/10.1016/s0040-4020(01)00122-3
https://doi.org/10.1016/s0040-4020(01)00122-3
Publikováno v:
Zeitschrift für Naturforschung B. 55:671-676
The crystal structures of two isomeric compounds, 2-endo-hydroxybornane-3-endo-carboxylic acid and 2 -exo -hydroxybomane-3 -endo-carboxylic acid, have been determined by X-ray single crystal analysis. The only difference between these two compounds i
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::19d7318455cf89a3df36c81e6c29d9dd
https://doi.org/10.1515/znb-2000-0801
https://doi.org/10.1515/znb-2000-0801
Publikováno v:
Zeitschrift für Naturforschung B. 55:677-684
The tendency of forming mixed carboxyl-to-oxime hydrogen bonds was tested on the series of bornane derivatives: one with the acid function only (bornane-2-endo-carboxylic acid), one with the oxime function (2,2′-diethylthiobomane-3-oxime), and one
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::33ef39d03534e6368ba11923b1fb473a
https://doi.org/10.1515/znb-2000-0802
https://doi.org/10.1515/znb-2000-0802
Autor:
Wieslaw Z. Antkowiak, Wolfgang Schnick, Irena Wolska, Teresa Borowiak, Wolfgang Milius, Artur Korzański
Publikováno v:
ResearcherID
The crystal structures of two compounds containing enaminone heterodiene systems and forming intermolecular hydrogen bonds N-H·O are reported: 1) 3-ethoxycarbonyl-2-methyl-4-pyridone (hereafter ETPY) and 2) 3-ethoxycarbonyl-2-phenyl-6-methoxycarbony
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8648a94d8ffd21278a5a5e724c3dfc07
https://doi.org/10.1515/znb-2000-0103
https://doi.org/10.1515/znb-2000-0103
Publikováno v:
Acta Crystallographica Section C Crystal Structure Communications. 51:1590-1593
The crystal structures of 2-(2-methoxyphenyl)pyridine 1-oxide, C 12 H 11 NO 2 (1), and 2-(2-methoxyphenyl)-3-methylpyridine 1-oxide, C 13 H 13 NO 2 (2), have been determined. The dihedral angle between the least-squares planes of the aromatic rings i
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7615552fb7227d34e40d5ae445b8f4f3
https://doi.org/10.1107/s0108270195002083
https://doi.org/10.1107/s0108270195002083
Publikováno v:
Acta Crystallographica Section C Crystal Structure Communications. 51:458-461
The crystal structures of 1-hydroxy-5,6-dihydro-12-azabenz[a]anthracene N-oxide (1), C 17 H 13 NO 2 , and 1-methoxy-5,6-dihydro-12-azabenz[a]anthracene N-oxide (2), C 18 H 15 NO 2 , have been determined. In both (1) and (2), the 2-phenylquinoline N-o
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3674d679d47007d6ed5dd037b17d1ca5
https://doi.org/10.1107/s0108270194003665
https://doi.org/10.1107/s0108270194003665
Publikováno v:
Acta Crystallographica Section C Crystal Structure Communications. 51:462-465
The crystal structures of 4-methoxy-11-oxo-5-azabenzo[b]fluorene N-oxide, C 17 H 11 NO 3 , (1), and its free base, 4-methoxy-11-oxo-5-azabenzo[b]fluorene, C 17 H 11 NO 2 , (2), have been determined. The 2-phenylquinoline skeleton in both compounds ha
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ab55151c112046cfa83cd8f8e16191e6
https://doi.org/10.1107/s0108270194010528
https://doi.org/10.1107/s0108270194010528
Autor:
Mariusz Popenda, Ewa Biala, Jan Milecki, Wieslaw Z. Antkowiak, Ryszard W. Adamiak, Andrzej Kowalewski
Publikováno v:
Scopus-Elsevier
ResearcherID
ResearcherID
Chemical synthesis of 2'-O-[13C]methyl-rCGCGCG and 5-methyl-rCGCGCG using support-aided phosphoramidite method is presented. 2'-O-Methyl guanosine derivative was separated from its 3'-O-methyl counterpart using transient 5',3'-O-silylation with 1,3-d
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::940d5fd175b297626edcd051abc3520c
https://doi.org/10.18388/abp.1993_4793
https://doi.org/10.18388/abp.1993_4793
Publikováno v:
Journal of Crystallographic and Spectroscopic Research. 23:113-118
The crystal structure of 5-hydroxy-9,10-dihydro-4-azaphenanthrene-4-oxide has been determined. The asymmetric unit contains three molecules which slightly differ in their geometries. The 2-phenylpyridine skeleton has been stiffened by linking in the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::cfa894e3e873d3dc95dbf95b5f69d348
https://doi.org/10.1007/bf01195445
https://doi.org/10.1007/bf01195445