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Beiträge zur Weiterentwicklung der Olefinmetathese Naturstoffsynthese und neue Katalysatoren /Buschmann, Nicole. January 2002 (has links) (PDF)
Berlin, Techn. Univ., Diss., 2002. / Computerdatei im Fernzugriff.
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Beiträge zur Weiterentwicklung der Olefinmetathese Naturstoffsynthese und neue Katalysatoren /Buschmann, Nicole. January 2002 (has links) (PDF)
Berlin, Techn. Univ., Diss., 2002. / Computerdatei im Fernzugriff.
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Neue Titan- und Zirconiumkomplexe für die homogene OlefinpolymerisationNaberfeld, Guido. January 2000 (has links) (PDF)
Bochum, Universiẗat, Diss., 2000.
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Development of new ruthenium catalysts for homogeneous and heterogeneous olefin metathesisKrause, Jens Olaf. January 2004 (has links) (PDF)
München, Techn. Univ., Diss., 2004.
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Dichtefunktionalstudien zu katalytischen Aktivitäten und NMR-chemischen Verschiebungen von Titan- und Eisen-KomplexenMauschick, Frank Thomas. January 2003 (has links) (PDF)
Wuppertal, Universiẗat, Diss., 2003.
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Synthese neuer Katalysatoren für die Epoxidierung von langkettigen, unfunktionalisierten, terminalen Olefinen mit WasserstoffperoxidMegido Almaraz, Benigno. January 2003 (has links) (PDF)
Köln, Universiẗat, Diss., 2003.
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Mechanismus der Olefinpolymerisation mit Metallkatalysatoren der 8. GruppeBabik, Sebastian Thomas. January 2004 (has links)
Düsseldorf, Universiẗat, Diss., 2004.
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Epoxidierung von Olefinen mit Wasserstoffperoxid : Neue katalytische Systeme auf der Basis fluorierter Alkohole /Hüttenhain, Daniel. January 2007 (has links)
Thesis (doctoral)--Universität Köln, 2007.
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Asymmetric aziridination of alkenesTughan, Garfield Cecil January 1987 (has links)
The work contained in this thesis is essentially concerned with the development of methods for the asymmetric aziridination of prochiral alkenes using N-nitrenes. The studies carried out are a necessary first step in a strategy directed towards the enantiospecific functionalization of alkenes. The addition of the N-nitrenes derived by oxidation of the chiral 1-amino-2-(l ,2,2-trimethylpropyl) benzimidazole and chiral 3-amino-2-(l,2,2-trimethylpropyl)quinazolin-4 (3H)-one (in the presence of TFA) to prochiral alkenes are found to proceed with moderate to high diastereoselectivities. The asymmetric inductions obtained are rationalized in most cases by a transition state geometry for the addition of the N-nitrene to the alkene. A method of carrying out chiral oxoquinazolinyl nitrene additions to alkenes both at low temperature (-60°C) (with the expected increase in diastereoselectivity) and with ~ molar equivalents of the alkene (with little loss of yield of the aziridine) is also developed. Conformational studies on the 7-(3,4-dihydro-2-(l,2,2-trimethyl- propyl) -4-oxoquinazolin-3-yl) -2-oxa-7-aza-spiro [4,2] -heptane-1-one are also carried out and reveal an unexpected orientation around the N-N bond, by comparison with other hydrazines, both in the crystal and in solution.
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Carbohydrate-Catalyzed Enantioselective Alkene Diboration and Its Synthetic Application:Yan, Lu January 2020 (has links)
Thesis advisor: Marc L. Snapper / This dissertation will present four main projects that I have been working on since January 2015. The first two chapters will be focusing on the developments of the carbohydrate-catalyzed enantioselective alkene diboraiton. The exchange catalysis between carbohydrate-derived diol catalyst and diboron starting material renders the alkene diboration reaction possible without the aid from transition metals. This successfully brought down the cost for the enantioselective alkene diboration, making it an appealing tool for alkene transformation. Detailed mechanistic study that leads to the reaction efficiency improvements were discussed in chapter 2. The third chapter of this dissertation is about the developments of site-selective oxidation of 1,2-bis(boronate). This is a new type of a reaction motif that the alkene diboration product can undergo. The secondary boronic ester of the 1,2-bis(boronate) was selectively oxidized to hydroxyl group while leaving the primary boronic ester untouched. This new reaction opens up a variety of opportunities to transform 1,2-bis(boronate) into different functional groups. Lastly, in the fourth chapter, recent synthetic methods developed in the Morken group was used in the total synthesis study of complex natural product Amphidinolide C. As it is disclosed, the carbohydrate-catalyzed enantioselective alkene diboration proved to be a powerful transformation either in early stage starting material preparation or in late stage complex structure motif functionalization. / Thesis (PhD) — Boston College, 2020. / Submitted to: Boston College. Graduate School of Arts and Sciences. / Discipline: Chemistry.
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