Browsing Fakultät für Chemie (inkl. GAUSS) by Title
Now showing items 534-553 of 763
-
Ruthenium- and Cobalt-Catalyzed Chelation-Assisted C-H Functionalizations
(2015-07-09)Ruthenium- and cobalt-catalyzed C-H activations have been discribed in this thesis, which provided expedient routes to the synthesis of synthetically useful compounds. Moreover, detailed mechanistic studies were also ... -
Ruthenium- and Cobalt-Catalyzed Chelation-Assisted C–H Functionalization
(2017-09-11)Catalytic C−H functionalization has emerged as an economically-attractive and environmentally-benign alternative to conventional cross-coupling approaches. Thus, major efforts have been made on transformations of inert C–H ... -
Ruthenium- and Manganese-Catalyzed C−O and C−C Formation via C−H Activation
(2016-06-08)In the past several decades, transition metal-catalyzed cross-coupling reactions have been proved to be one of the most useful and reliable tools for C−C bond formation. However, the prefunctionalized organometallic ... -
Ruthenium-Catalyzed Synthesis of Biaryls through C–H Bond Functionalizations
(2013-11-15)The main focus of this work was the development of new methodologies for the efficient and step-economical synthesis of biaryls cores by direct arylation through direct C–H bond cleavage. In this aim, the first ruthenium-catalyzed ... -
Rutheniumkatalysierte Addition von nicht aktivierten C(sp²)–H- und C(sp³)–H-Bindungen an Alkene
(2013-04-30)Novel site-selective carboxylate assisted ruthenium-catalyzed hydroarylations of unactivated alkenes, bearing valuable functional groups, with various (hetero)arenes has been accomplished. And a unprecedented ruthenium ... -
Rußbildung in der Kohlenwasserstoffpyrolyse hinter Stoßwellen
(2015-06-08)For the formation of soot in pyrolysis of n-hexane, benzene and other hydrocarbons behind shock waves induction periods, soot growth rate constants and soot yields were measured at various temperatures, pressures and ... -
S-Substituted Dibenzothiophenium Triflates: Synthesis, Structure and Reactivity
(2021-04-23)The content of this thesis focused on the general syntheses and applications S-substituted alkynyl-, alkenyl- and aryldibenzothiophenium triflates. Addition reactions have been performed from S-alkynyldibenzothiophenium ... -
S2 State Photodissociation of Diphenylcyclopropenone, Vibrational Energy Transfer along Aliphatic Chains, and Energy Calculations of Noble Gas-Halide Clusters
(2014-06-10)In this work, three major topics are investigated. The decarbonylation of diphenylcyclopropenone from its second excited electronic state forms the first part. This reaction was investigated using pump laser pulses of ... -
Scattering of vibrationally excited NO from vanadium dioxide
(2020-01-24)This work investigates the surface dynamics of vanadium dioxide with nitric oxide in dependence of its metal-to-insulator transition (MIT) at 68 °C. At lower temperatures VO2 has a monoclinic lattice structure which has ... -
Schwingungsdynamik in O−H···O-verbrückten Aggregaten: FTIR-Spektroskopie vom Nah- bis zum Ferninfraroten
(2015-10-13)This work focuses on the vibrational dynamics of molecular clusters featuring intermolecular O–H···O hydrogen bonds. For this purpose the clusters are generated in supersonic jet expansions and probed via FTIR spectroscopy ... -
Schwingungsspektroskopie nah- und überkritischer Lösungsmittel
(2013-07-29)Expansions of compressed fluids find wide application. Here, they are characterized via vibrational spectroscopy. The focus is on the phase state of particles emerging from flash atomization of compressed liquids. As a ... -
Schwingungsspektroskopische Untersuchung der Aggregation und Isomerisierung von Modellpeptiden in der Jet-Expansion am Beispiel kleiner sekundärer Amide
(2021-08-06)Small secondary amides serve as simple and yet realistic model systems for hydrogen bonds in peptides and the rotational isomerization about the actual peptide bond. The preferred structures of small amide clusters (e. ... -
Schwingungsspektroskopische Untersuchungen der Wasserstoffbrückendynamik in Alkohol-α-Hydroxyester-Komplexen aus topologischer und chiraler Perspektive
(2024-04-26)The success of an organocatalytic reaction in which the bond between substrate and catalyst is non-covalent, e.g. in the form of a hydrogen bond, is determined by the topology of the hydrogen bond in the prereactive complex. ... -
Schwingungsspektroskopische Untersuchungen zur Chiralitätserkennung und Torsionsdynamik bei Alkoholen
(2020-10-20)In this thesis different implications of molecular chirality are explored by experimental and quantum chemical methods. Discriminating interactions between molecules of different handedness, termed chirality recognition, ... -
Searching for more π-acceptor phosphines: From α-pyridiniophosphines to α-cationic phospholes
(2022-04-07)This thesis focuses on two classes of cationic phosphines. In the first part, the previously developed cationic pyridinio-phosphines were investigated further in respect to their coordination chemistry towards Ir and their ... -
Segregation von Wasserstoff und Deuterium an Versetzungen in Palladium
(2000-12-13)Small angle neutron scattering (SANS) measurements on Pd samples containing dislocations with a high dislocation density reveal an additional intensity for a scattering vector of 0.02 to ... -
Sekundärstoffe aus endophytischen Pilzen mariner Habitate und Abbaureaktionen an Simocyclinon D8
(2008-01-09)This thesis deals with the isolation, characterization und chemical derivatization of natural products. Most of the described metabolites show a high potential biological activity which is ... -
Selective C-H Activation: Ruthenaelectro-Catalysis and Carborane Cage Activation
(2021-10-05)Synthetic organic chemistry mainly focuses on the cleavage and formation of bonds in a practical and selective fashion, where the formation of carbon-carbon (C-C) and C-Heteroatom (C Het) bonds constitutes one of the most ... -
Selective C–H Activation by Ruthenium(II) Carboxylate and Nickelaelectro-Catalysis
(2021-01-28)This doctoral thesis was divided into two main parts. In the first part, ruthenium(II)-catalyzed ortho-C–H alkynylations of diverse benzoic acids were achieved for the synthesis of aromatic alkynes. And meta-C–H activations, ... -
Selectivity Control in 3d Transition Metal-Catalyzed C–H Activation
(2019-08-23)Methods for the selective functionalization of otherwise inert C–H bonds have been recognized as a transformative tool in synthetic organic chemistry, with applications ranging from the synthesis of complex bioactive ...