Browsing Fakultät für Chemie (inkl. GAUSS) by Referee "Tietze, Lutz Prof. Dr. Dr. h.c."
Now showing items 1-20 of 31
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Bestimmung und Modellierung der Initiatoreffektivität von Diazenen in der Ethen-Hochdruckpolymerisation
(2005-07-29)In this thesis the initiator efficiency of diazenes (azoalkanes), R-N=N-R', in the high-pressure ethene polymerization was determined in a continuously stirred tank reactor. The initiator ... -
Catalytic Insertion Reactions into the Cyclopropane Ring Syntheses of Various Belactosin C Congeners and Analogues
(2008-09-17)Catalytic insertion reactions of various cyclic (4-phenyl-1,2,4-triazoline-3,5-dione, PTAD) and acyclic (azobenzene, ethyl phenyldiazenecarboxylate and diisopropyl azodicarboxylate) diazene ... -
Chemisches Screening von ausgewählten Actinomyceten sowie Strukturaufklärung von Sekundärmetaboliten aus Micromonospora sp. und Pflanzen
(2004-04-27)The core of this thesis is the study of microorganisms and plants of different sources with regard to their production of secondary metabolites.The first part deals with 35 actinomycete ... -
Cobalt(III)- and Manganese(I)-Catalyzed C-H and C-C Activations
(2019-03-28)Metal-catalyzed C─H and C─C functionalizations have become an increasingly viable approach, which allows the direct formation of C─C and C─heteroatom bonds in an atom- and step-economical manner. However, the significant ... -
Diversity-Oriented Assembly of C-Glycosides via Late-Stage C−H Glycosylation
(2023-08-29)C-glycosides are widely distributed structural motifs found in natural products and commercially available drug molecules. Due to the stability of glycosidic C-C bonds against chemical and enzymatic hydrolysis, only ... -
Domino Reactions for the Syntheses of Chiral Chromanes ‒ Enantioselective Total Syntheses of (‒)-Diversonol, (‒)-Blennolide C, (‒)-Gonytolide C and Formal Synthesis of Siccanin
(2015-06-15)The general objective of this thesis is to demonstrate the synthetic utility of the domino concept in the complex setting of natural product synthesis. Key step is a palladium-catalyzed domino Wacker/carbonylation/methoxylation ... -
Domino-Reaktionen mit anti-Carbopalladierungen an Alkinen als Schlüsselschritt und Transformationen von Arylthiocyanaten mit Arinen
(2015-09-09)The work presents a formal anti-carbopalladation reaction of alkynes imbedded into a domino reaction for the synthesis of oligo cyclic structures. Therefore, intra- as well as intermolecular approaches were performed. ... -
Der Einfluß von chemischer Konstitution, Symmetrie und molekularer Umgebung auf die intramolekulare Schwingungsrelaxation aromatischer Moleküle
(2006-03-24)This thesis focuses on elucidating mechanisms of intramolecular vibrational energy redistribution (IVR). It constitutes a comparative study on structurally closely related aromatic molecules ... -
Entwicklung katalytischer Kreuzkupplungs- und Hydroaminierungsreaktionen
(2008-11-13)In recent years great efforts have been taken for the development of highly active catalysts in the field of hydroamination- and cross-coupling-reactions. However, there is still a lack of ... -
Experimental Electron Density Determination of Unconventionally Bonded Boron
(2009-07-22)Two major aims have been pursued in the course of this thesis. On the one hand, reasons for the different reactivities of two Lewis acids based on tris(pentafluorophenyl)borane, namely ... -
Isolierung, Strukturaufklärung und Biosynthese von Sekundärmetaboliten endophytischer Pilze aus Algen und Pflanzen mariner Habitate
(2005-10-18)The core of the present thesis is the study of endophytic fungi with regard to their production of secondary metabolites. Altogether 56 fungal strains were both chemically and biologically ... -
Methanophenazin: Strukturaufklärung und Totalsynthese eines neuartigen Cofaktors aus methanogenen Archaea
(2002-10-30)Methanogenesis is the terminal step in the degradation of complex organic compounds and essential for the mineralization of organic material. The formation of methane from simple compounds ... -
New Applications of Methyl 2-Chloro-2-cyclopropylideneacetate Towards the Synthesis of Biologically Important Heterocycles
(2005-09-23)The work in this thesis starts with the advanced synthesis of methyl 2-chloro- and 2-bromo-2-cyclopropyledeneacetate (4-Me and 5). The cyclopropanol derivative (31) obtained by Kulinkovich ... -
Oxygen Bridged Metal Systems: Heterometallic Compounds Containing Main Group Metal, Transtion Metal and f-Elements
(2011-10-31)This dissertation lays emphasis mainly on the synthesis and structural studies of oxygen bridged heterobi- and trimetallic complexes containing main group metal, transition metal and ... -
Potentiell photochrome brückenkopfsubstituierte Furo[2,3-d]furane
(2002-04-08)Within the scope of this thesis a photochromic system consisting of furo[2,3-d]furans and bis-quinonemethides was investigated. In the literature the known compounds of this system are ... -
Resource-Economical C–H Activation for Late-Stage Functionalization
(2021-07-07)Organic synthesis has traditionally relied on step-, time- and resource-intensive strategies, namely the functional group interconversion and, more recently, on cross-coupling reactions. These approaches have enabled the ... -
Selektive Halogenierungen unter Phasentransferbedingungen: Mechanistische Untersuchungen und Synthetische Anwendungen
(2001-08-01)The present thesis deals with a new selective method for halogenation (Cl, Br,I) of organic compounds in multiphase systems. Systematic variations of the reaction conditions led to strong ... -
Sustainable Methods in C–H Functionalizations
(2023-05-30)Cross-coupling chemistry has matured in an attractive tool in synthetic organic chemistry to realized efficient formation of C‒C and C‒Het bonds. However, these transformations are also associated with certain drawbacks, ... -
Synthese und biologische Evaluation neuartiger Duocarmycin-Analoga für eine selektive Krebstherapie
(2013-06-07)To date most anticancer agents interact with the cell cycle and therefore traditionally damage only cells with high proliferation rates. The usually insufficient differentiation between normal and malignant cells results ...