Zobrazeno 1 - 10
of 62
pro vyhledávání: '"Alexander A. Kolomeitsev"'
Autor:
Oleg O. Shyshkov, Alexander A. Kolomeitsev, Berthold Hoge, Enno Lork, Axel Haupt, Mira Keßler, Gerd‐Volker Röschenthaler
Publikováno v:
Chemistry (Weinheim an der Bergstrasse, Germany). 28(14)
Phosphoranides are interesting hypervalent species which serve as model compounds for intermediates or transition states in nucleophilic substitution reactions at trivalent phosphorus substrates. Herein, we report on the syntheses and properties of s
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e2daa1e7202a59233e2291e6d8e41dec
https://pubmed.ncbi.nlm.nih.gov/35025112
https://pubmed.ncbi.nlm.nih.gov/35025112
Publikováno v:
Global Oceans 2020: Singapore – U.S. Gulf Coast.
The authors propose a new modular design of an underwater vehicle in the article. The core idea is the complete separation of an underwater vehicle on different self-sustaining modules with its control and power system. It is proposed that wireless t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b60821fa1bcc1d6e7e86dad432fc9169
https://doi.org/10.1109/ieeeconf38699.2020.9389134
https://doi.org/10.1109/ieeeconf38699.2020.9389134
Autor:
Ivar Koppel, Alexander A. Kolomeitsev, Lauri Lipping, Ilmar A. Koppel, Ivo Leito, Gerd-Volker Röschenthaler
Publikováno v:
The Journal of Organic Chemistry. 75:6436-6444
The study of the polyfluorination and polytrifluoromethylation effects on electronic structure and intrinsic acidities has been performed using DFT B3LYP and NBO calculations for the valence isomers of benzene and phenol, i.e., the structures of pris
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::34c82051635291ff817e67876f341539
https://doi.org/10.1021/jo101061u
https://doi.org/10.1021/jo101061u
Autor:
Magdalena Milewska, Henryk Koroniak, Gerd-Volker Röschenthaler, Romana Pajkert, Alexander A. Kolomeitsev
Publikováno v:
Tetrahedron Letters. 49:6046-6049
A straightforward methodology for the synthesis of diethyl γ-hydroxy-α,α-difluoromethylenephosphonates is reported. In the presence of titanium tetrachloride, epoxide ring-opening reactions occurred upon treatment with lithium diethyl difluorometh
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::74e992628d61be1320e0dcaaf41adc3b
https://doi.org/10.1016/j.tetlet.2008.07.146
https://doi.org/10.1016/j.tetlet.2008.07.146
Autor:
Eduard B. Rusanov, Toomas Rodima, I. Koppel, Gea Ovsjannikov, Agnes Kütt, Maurice Médebielle, Alexander A. Kolomeitsev, Juta Koppel, Viljar Pihl, Ivo Leito, Valeria Movchun, Ilmar A. Koppel, Masaaki Mishima, Lauri Toom, Ivari Kaljurand, Gerd-Volker Röschenthaler, Enno Lork, Timo Dansauer
Publikováno v:
The Journal of Organic Chemistry. 73:2607-2620
A general route to functionalized pentakis(trifluoromethyl)phenyl (C6(CF3)5) derivatives, promising building blocks for designing novel stable carbenes, radical species, superacids, weakly coordinating anions and other practically and theoretically u
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e2ba82c72a648d12327ad4a4ff476003
https://doi.org/10.1021/jo702513w
https://doi.org/10.1021/jo702513w
Publikováno v:
Tetrahedron Letters. 49:449-454
Hydrolytically stable and easy to handle trifluoromethyl triflate was found to be a liquid reservoir of ‘masked’ difluorophosgene. Anhydrous F − sources cleave the S–O bond in trifluoromethyl triflate yielding quantitatively the trifluorometh
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a1e49efa27faa237147a5e2df8045223
https://doi.org/10.1016/j.tetlet.2007.11.105
https://doi.org/10.1016/j.tetlet.2007.11.105
Autor:
Ilmar A. Koppel, Toomas Rodima, Vahur Mäemets, Gerd-Volker Röschenthaler, Alexander A. Kolomeitsev, Ivari Kaljurand, Ivo Leito, I. Koppel, Jan Alexander Barten, Agnes Kütt, Enno Lork
Publikováno v:
Journal of the American Chemical Society. 127:17656-17666
A principle for creating a new generation of nonionic superbases is presented. It is based on attachment of tetraalkylguanidino, 1,3-dimethylimidazolidine-2-imino, or bis(tetraalkylguanidino)carbimino groups to the phosphorus atom of the iminophospho
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6c64835f0a2a70bcb6d589846d22dac1
https://doi.org/10.1021/ja053543n
https://doi.org/10.1021/ja053543n
Autor:
Axel Dr. Pleschke, Alexander Dr. Kolomeitsev, A. Marhold, G.‐V. Roeschenthaler, Marielouise Schneider
Publikováno v:
Journal of Fluorine Chemistry. 125:1031-1038
An increasing number of biologically active compounds in the pharma and agro-chemical sector contain carbon fluorine bonds. One of the most common methods to introduce fluorine into intermediates is the well-investigated halogen-exchange reaction, in
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a68cc1d578f6a6e645f84495f1822804
https://doi.org/10.1016/j.jfluchem.2004.01.030
https://doi.org/10.1016/j.jfluchem.2004.01.030
Autor:
Magdalena Milewska, Joanna Szczepkowska-Sztolcman, Gerd-Volker Röschenthaler, Henryk Koroniak, Jan Alexander Barten, Alexander A. Kolomeitsev, German Bissky, A. A. Kadyrov
Publikováno v:
Tetrahedron Letters. 44:8273-8277
Lithium and potassium trifluoromethyl-, pentafluoroethyl- and [(diethylphosphinyl)difluoromethyl]trialkoxyborates were synthesized by reaction of either perfluoroalkyllithium or (perfluoroalkyl)trimethylsilane/F − with trialkoxyboranes. Treatment o
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::81b1049cfa784bce595a59192427f354
https://doi.org/10.1016/j.tetlet.2003.09.072
https://doi.org/10.1016/j.tetlet.2003.09.072
Autor:
Gerd‐Volker Roeschenthaler, Alexander A. Kolomeitsev, Martin H. Koenigsmann, Dmitri V. Sevenard, Vyacheslav Ya. Sosnovskikh
Publikováno v:
Tetrahedron Letters. 44:7623-7627
In a convenient and efficient procedure, the nucleophilic 1,4-trifluoromethylation of several α,β-enones using (trifluoromethyl)trimethylsilane was achieved. The high regioselectivity of the reaction has been reached by blocking the carbonyl moiety
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7ced40a57498762d0edac9d6750cbe55
https://doi.org/10.1016/j.tetlet.2003.08.050
https://doi.org/10.1016/j.tetlet.2003.08.050