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Showing 1 to 8 of 8 (0.084 seconds)Spelling suggestions: "subject:"asymmetrische catalyse"" "subject:"asymmetrische katalyse""
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Enantioselektive Synthese bioaktiver Flavane und IsoflavaneKeßberg, Anton 12 June 2018 (has links) (PDF)
Im Rahmen dieser Arbeit wird eine neuartige Deoxygenierungskaskade von Flavanonen bzw. Isoflavanonen via asymmetrischer Transferhydrierung (ATH) beschrieben. Diese Methodik ermöglicht einen einstufigen Zugang zu enantiomerenreinen Flavanen bzw. Isoflavanen aus entsprechenden racemischen Ketonen. Unter Verwendung der ATH-Deoxygenierungskaskade werden hoch enantioselektive Naturstoffsynthesen elaboriert. So erfolgt eine effiziente Darstellung der Flavane Brosimin A, Brosimin B, Brosimacutin L, Kazinol U und 7,3‘-Dihydroxy-4‘-methoxyflavan. Darüber hinaus wird mittels dynamischer kinetischer Racematspaltung die Totalsynthese der Isoflavane Equol, Manuifolin K und Eryzerin D beschrieben.
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Enantioselektive Synthese bioaktiver Flavane und IsoflavaneKeßberg, Anton 29 May 2018 (has links)
Im Rahmen dieser Arbeit wird eine neuartige Deoxygenierungskaskade von Flavanonen bzw. Isoflavanonen via asymmetrischer Transferhydrierung (ATH) beschrieben. Diese Methodik ermöglicht einen einstufigen Zugang zu enantiomerenreinen Flavanen bzw. Isoflavanen aus entsprechenden racemischen Ketonen. Unter Verwendung der ATH-Deoxygenierungskaskade werden hoch enantioselektive Naturstoffsynthesen elaboriert. So erfolgt eine effiziente Darstellung der Flavane Brosimin A, Brosimin B, Brosimacutin L, Kazinol U und 7,3‘-Dihydroxy-4‘-methoxyflavan. Darüber hinaus wird mittels dynamischer kinetischer Racematspaltung die Totalsynthese der Isoflavane Equol, Manuifolin K und Eryzerin D beschrieben.
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A family of 2D and 3D coordination polymers involving a trigonal tritopic linkerHauptvogel, Ines Maria, Bon, Volodymyr, Grünker, Ronny, Baburin, Igor A., Senkovska, Irena, Müller, Uwe, Kaskel, Stefan 08 April 2014 (has links) (PDF)
Five new coordination polymers, namely, [Zn2(H2O)2(BBC)](NO3)(DEF)6 (DUT-40), [Zn3(H2O)3(BBC)2] (DUT-41), [(C2H5)2NH2][Zn2(BBC)(TDC)](DEF)6(H2O)7 (DUT-42), [Zn10(BBC)5(BPDC)2(H2O)10](NO3)(DEF)28(H2O)8 (DUT-43), and [Co2(BBC)(NO3)(DEF)2(H2O)](DEF)6(H2O) (DUT-44), where BBC – 4,4′,4′′-(benzene-1,3,5-triyl-tris(benzene-4,1-diyl))tribenzoate, TDC – 2,5-thiophenedicarboxylate, BPDC – 4,4′-biphenyldicarboxylate, DEF – N,N-diethylformamide, were obtained under solvothermal conditions and structurally characterized. It has been shown that compounds DUT-40, DUT-41 and DUT-44 exhibit 2D layered structures with large hexagonal channels. Utilization of additional angular dicarboxylic TDC linker led to the formation of the DUT-42 compound with the structure consisting of three interpenetrated 3D networks. Using the linear co-linker dicarboxylic BPDC, DUT-43 was obtained which forms a complicated 3D architecture arising from the polycatenation of triple-layered 2D building units and 2D single layer units. The pore accessibility of the synthesized compounds in the liquid phase was proved by the adsorption of dye molecules. / Dieser Beitrag ist mit Zustimmung des Rechteinhabers aufgrund einer (DFG-geförderten) Allianz- bzw. Nationallizenz frei zugänglich.
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Neue Zugänge zu enantioselektiven lipolytischen Enzymen durch fluoreszenzbasierte Durchmusterung kombinatorischer Bibliotheken / Novel approaches to enantioselective lipolytic enzymes via fluorescence based screening of combinatorial librariesBecker, Stefan 31 October 2007 (has links)
No description available.
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Bifunctional Thiourea-Based Organocatalysts for Asymmetric C-C Bond Formation Reactions: Strecker, Nitro-Michael, Mannich / Bifunktionelle Thioharnstoff-Organokatalysatoren für Asymmetrische C-C-Knüpfungsreaktionen: Strecker, Nitro-Michael, MannichYalalov, Denis 01 November 2007 (has links)
No description available.
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A family of 2D and 3D coordination polymers involving a trigonal tritopic linkerHauptvogel, Ines Maria, Bon, Volodymyr, Grünker, Ronny, Baburin, Igor A., Senkovska, Irena, Müller, Uwe, Kaskel, Stefan January 2012 (has links)
Five new coordination polymers, namely, [Zn2(H2O)2(BBC)](NO3)(DEF)6 (DUT-40), [Zn3(H2O)3(BBC)2] (DUT-41), [(C2H5)2NH2][Zn2(BBC)(TDC)](DEF)6(H2O)7 (DUT-42), [Zn10(BBC)5(BPDC)2(H2O)10](NO3)(DEF)28(H2O)8 (DUT-43), and [Co2(BBC)(NO3)(DEF)2(H2O)](DEF)6(H2O) (DUT-44), where BBC – 4,4′,4′′-(benzene-1,3,5-triyl-tris(benzene-4,1-diyl))tribenzoate, TDC – 2,5-thiophenedicarboxylate, BPDC – 4,4′-biphenyldicarboxylate, DEF – N,N-diethylformamide, were obtained under solvothermal conditions and structurally characterized. It has been shown that compounds DUT-40, DUT-41 and DUT-44 exhibit 2D layered structures with large hexagonal channels. Utilization of additional angular dicarboxylic TDC linker led to the formation of the DUT-42 compound with the structure consisting of three interpenetrated 3D networks. Using the linear co-linker dicarboxylic BPDC, DUT-43 was obtained which forms a complicated 3D architecture arising from the polycatenation of triple-layered 2D building units and 2D single layer units. The pore accessibility of the synthesized compounds in the liquid phase was proved by the adsorption of dye molecules. / Dieser Beitrag ist mit Zustimmung des Rechteinhabers aufgrund einer (DFG-geförderten) Allianz- bzw. Nationallizenz frei zugänglich.
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Atroposelective Synthesis of 2,2ʹ-Bis(arylamino)-1,1ʹ-biaryls by Oxidative Iron(III)- and Phosphoric Acid-Catalyzed C–C Coupling of DiarylaminesFritsche, Raphael F., Schuh, Tristan, Kataeva, Olga, Knölker, Hans-Joachim 22 February 2024 (has links)
We describe an iron-catalyzed asymmetric oxidative C−C coupling of diarylamines which proceeds at room temperature with air as final oxidant. Using hexadecafluorophthalocyanine-iron(II) as catalyst in the presence of catalytic amounts of an axially chiral biaryl phosphoric acid, the resulting chiral 2,2′-diamino-1,1′-biaryls are obtained in up to 90 % ee as confirmed by chiral HPLC. A detailed mechanism has been proposed with a radical cation-chiral phosphate ion pair as key intermediate leading to the observed asymmetric induction.
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Totalsynthese der Mansouramycine A-E aus Streptomyces sp. und Rhodium-katalysierte 1,2-Additionen an cyclische Enone / Total synthesis of Mansouramycine A-E from streptomyces sp. and rhodium catalized 1,2-additions to cyclic enonesBeerlink, Johannes 14 October 2008 (has links)
No description available.
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