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Showing 1 to 12 of 12 for “"Paracyclophane"”.
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Synthese substituierter chiraler [2.2]Paracyclophane und deren Einsatz in asymmetrischen Katalysereaktionen
… only few planar chiral compounds based on [2.2]paracyclophane were tested as ligands in asymmetric catalytic reactions. In the course of this PhD thesis, disubstituted chiral [2.2]paracyclophanes were synthesized and tested as ligands in asymmetric, catalytic reactions. One of three topics was …
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Redox properties of Bis-Triarylamines and ligand properties of Thianthrenophane
… relaxes in a symmetry broken CT state. The [2.2]paracyclophane bridged dimer is an example for a weakly coupled system, because the spectroscopic behavior is very similar to the corresponding p xylene monomer. In contrast, anthracene as well as p-xylene bridges mediate a stronger coupling and …
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Vanadium-katalysierte, asymmetrische Epoxidierung von Allylalkoholen
… centres, as well as from planar chiral [2.2]paracyclophanes and ferrocenes. Best results involving enantioselectivity of the epoxide formation were achieved using ligands with the [2.2]paracyclophane framework. Further studies towards the optimisation of the epoxidation method were carried …
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Asymmetrischer katalytischer Phenyltransfer zur Synthese von Diarylmethanolen und Diarylmethylaminen
… to masked N-formyl-imines employing [2.2]-paracyclophane-based ketimines was developed and is described.
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ALKYLATION AND OXIDATIONS OF SYMMETRICAL DIMETHYLENEBIPHENYL AND RELATED DIANIONS (CYCLOPHANE, BIPHENYLOPHANE, NMR, CONFORMATION).
… and n.0.n.0 cyclophanes. An X-ray study on 14.0 paracyclophane showed it to have a conformation different from that observed in solution by NMR; MM2 calculations were used in determining what the solution conformation is likely to be. Oxidation of the dianions produced the monomer …
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Synthese von planar chiralen Imidazoliumsalzen, ihren Metall-Carbenkomplexen und deren Verwendung in der asymmetrischen Katalyse
… mediated by a ferrocenyldiphosphane. [2.2]Paracyclophanes constitute another important class of planar chiral substances, which are also established as ligands in asymmetric catalysis. In this thesis, the planar chirality of the paracyclophanes was combined with the concept of …
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Verfahren zur Funktionalisierung und bioaktiven Ausrüstung von Implantatoberflächen für eine verbesserte Gewebeintegration
… material for the CVD-process 4-aminomethyl-[2.2]-paracyclophane was synthesised from 4-hydroxymethyl-[2.2]-paracyclophane in three high yielding steps. The respective products were identified by means of NMR, IR and MALDI-TOF-MS. The CVD-procedure led to an insoluble, transparent polymer film with …
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Molecular Encapsulation of Conjugated Polymers for Organic Electronics
… Specifically, the study centeres on [n]paracyclophane-based ([n]PC) conjugated polymers, designed to investigate various effects. These include altering the cyclophane chiral centre by changing the ansa unit, modifying the polymer morphology by changing the side chains, and varying the …
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Systematic Investigation of Intermolecular Interactions in NEXAFS Spectroscopy
… were systematically studied by using paracyclophane (PCP) molecules, in which the benzene/benzene separation distance can be systematically varied through the length of the spacer between benzene rings. The effects of Rydberg quenching on the degree of Rydberg-valence mixing in …
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Single Molecule Junction Conductance and Binding Geometry
… well-defined conductance is also obtained with paracyclophane molecules which bind to gold directly through the ð system. Next, we are able to create metal-molecule-metal junctions with more than one reproducible conductance signatures that can be accessed by changing junction geometry. In the …
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Funktionalisierung von Polydimethylsiloxan-Oberflächen zur Steuerung molekularer Zell-Substrat Wechselwirkungen
… and CVD-polymerisation of amino functionalized paracyclophane were also investigated. Lateral structuring of the surface functionalisation was achieved with mask techniques on a 10 µm scale. In a second step hydrogels were bound to PDMS surfaces which were functionalized in ammonia plasma. …
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Novel Low Dielectric Constant Thin Film Materials by Chemical Vapor Deposition
… from 4,5,7,8,12,13,15,16-octafluoro-[2.2]-paracyclophane (DVT-4). The main motivation was to find a cheaper alternative to poly( alpha, alpha , alpha ', alpha '-tetrafluoro-p-xylylene) (AF-4) with similar properties. The dielectric constant of VT-4 was measured as 2.42 at 1 MHz, and the …