Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 10 of 10 for “"Chirale Verbindungen"”.
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Neuartige hochselektive Katalysatoren für die asymmetrische Ketonhydrierung
… im Bereich der Agrarchemie werden häufig chirale Verbindungen benötigt. Für deren Herstellung gibt es bisher keine einzelne Technologie, die man als Patentrezept bezeichnen könnte. Die Synthese solcher Verbindungen mittels Metallkatalyse, die chemisch gesehen viele Vorteile bietet, ist …
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Chirale intramolekular koordinierte Alane
Several aluminum compounds Ar*AlR1R2, Ar*2AlR, and Ar*3Al (R, R1, R2 = Br, Cl, Me, tBu, Cp, and indenyl) incorporating the chiral ligand Ar* =2-[1-(S)-Me2NCH(Me)]C6H4, have been synthesized by salt metathesis reaction and have been characterized by multinuclear NMR (1H, 13C, 27Al), mass …
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Asymmetrische Synthese neuer planar- und zentral-chiraler Ferrocenylliganden
In this thesis we describe the enantioselective synthesis of mono- and di-ortho-substituted ferrocenyl diketones via our SAMP/RAMP-hydrazone method. Keystep is the stepwise diastereoselective ortho-metalation of 1,1'-bisbenzoylferrocene-bis-SAMP-hydrazone followed by trapping of various types of …
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Polymerization of olefins and functionalized monomers with zirconocene catalysts
The subject of this dissertation is the application of zirconocene catalysis to the polymerization of nonfunctional 1-olefins and functional olefins, such as methacrylates. The polymerization of 1-hexene with zirconocene/MAO catalyst systems is studied in order to elucidate the nature of the active …
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Selbstorganisation von Helicaten und molekularen Tetraedern
In this research hierarchical multi component self-assembly processes were investigated. The two ligands 2,3-dihydroxybenzaldehyde and 2,3-dihydroxyacetophenone were used for the multistep self-assembly of helicate-type dinuclear titanium(IV) or gallium(III) complexes in the presence of lithium …
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The synthesis of N-substituted ferrocenes and CH activation towards the synthesis of Organosilanols
In the present thesis, a Ru-catalyzed diastereoselective ortho-silylation of ferrocenyl oxazolines was achieved in poor to good yields and moderate to high diastereomeric ratios. To the best of our knowledge, this is the first catalytic and diastereoselective C–H activation on ferrocenes. After …
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Metal based asymmetric catalysis in Baeyer-Villiger oxidations
One of the objectives of the present thesis was to improve the efficiency of an aluminium-catalyzed Baeyer-Villiger oxidation. This system was based on a mediating species formed by enantiopure 2,2'-dihydroxy-1,1'-binaphthyl (BINOL) and Me2AlCl and utilized a hydroperoxide as oxidant. A first …
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Synthese neuer C 1-symmetrischer Monosulfoximine und deren Anwendung als Liganden in der asymmetrischen Katalyse
This PhD thesis describes the development of a new class of C1-symmetric monosulfoximines and their application as ligands in asymmetric catalysis. The main question, with which the research was concerned, is whether a ligand which does not possess C2-symmetry and has only one chiral sulfoximine …
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Ganzzellbiotransformationen mit rekombinanten Escherichia coli zur Synthese chiraler Alkohole
Whole cell biotransformation processes are of special interest for the synthesis of chiral compounds since microorganisms offer some advantages in comparison to chemical catalysts or even isolated enzymes. Due to their internal production of cofactors biotransformation processes using whole cell …