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Showing 1 to 11 of 11 for “"Planar Chirality"”.
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Synthese von planar chiralen Imidazoliumsalzen, ihren Metall-Carbenkomplexen und deren Verwendung in der asymmetrischen Katalyse
… addition to the properties of central and axial chirality, planar chirality plays a significant role in many asymmetric catalytic processes. The concept of planar chirality is often implemented by the application of metallocenes such as ferrocene derivatives. Some industrially important syntheses …
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Applications of planar-chiral phosphaferrocene-oxazolines in asymmetric catalysis and enantioselective desymmetrization by carbon nucleophiles in the presence of chiral ligands
In PART I, the design and the synthesis of planar-chiral phosphaferrocene-oxazolines, a new class of P,N-ligands, are described. The modular nature of their structure allows easy access to a number of analogues in enantiomerically pure forms, facilitating the easy tunability of the chiral …
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Planar chirale Metallocene
The element of planar chirality turned out to be of special importance to achieve high enantioselectivities in various asymmetric processes. In the course of this PhD thesis, the sulfoximine unit was established as a new chiral ortho-directing group for ferrocenes. By variation of the metal …
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Synthese substituierter chiraler [2.2]Paracyclophane und deren Einsatz in asymmetrischen Katalysereaktionen
The element of planar chirality turned out to be of special importance to achieve high enantioselectivities in various asymmetric processes. However, only few planar chiral compounds based on [2.2]paracyclophane were tested as ligands in asymmetric catalytic reactions. In the course of this PhD …
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The Synthesis and Characterization of Phosphonium Indenylide Complexes of Ruthenium(II)
… coordination, phosphonium indenylides exhibit planar chirality. These properties may potentially lead to interesting coordination chemistry and applications in catalysis.The phosphonium indenylides 1-C9H6PPh3 (I), 1-C9H6PMePh2 (II) and1-C9H6PMe2Ph (III) have been synthesized and reacted with …
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Ultrafast spectroscopy and control of correlated quantum materials
… charge density wave domains with opposite planar chirality, (iii) our discovery of an ultrafast reorientation transition in the antiferromagnetic semiconductor CaMn₂Bi₂, and (iv) second harmonic generation evidence for an amplitude-mode electromagnon in CuBr₂. I conclude by reflecting on …
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Total synthesis of macrocyclic bisbibenzyl natural products
… adopt a boat-shaped conformation, deviating from planarity. The natural product also exhibits optical activity despite containing no chiral centres, this being due to axial and planar chirality in the molecule. Herein, routes to these two natural products are presented. Key steps include a highly …
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Sintesi e coordinazione di leganti Ciclopentadienilici O-Multifunzionalizzati
… observed atropisomers 1a and 1b, by varying the planar chirality on the two π-complexes.
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Optically active [(eta 6 -arene)Cr(CO) 3]-based diphosphines : synthesis and application in asymmetric homogeneous hydrogenation
… ligands, which are endowed with central and planar chirality, offer a range of possibilities for their steric, electronic and conformational properties to be modulated. The new ligands have been prepared starting from [(h6-arene)Cr(CO)3] complexes derived from commercially available optically …
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Synthesis, structure and reactivity of chiral cyclopentadienylruthenium(II) complexes
… a combinationof metal-centred and ligand-derived chirality.The introductory chapter provides an overview of the types of chiralorganometallic complexes previously reported, general methods of synthesis,separation, and techniques for stereochemical determination.In the second chapter, a range of …
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Asymmetrische Synthese planar- und zentral-chiraler 1,2,3-trisubstituierter und 1,3-disubstituierter Ferrocene
Metallocenes and their most important derivative, ferrocenes, are important building blocks in many areas of modern organic chemistry due to their unique electronic and steric properties. Ferrocenes are predominantly used in catalysis, however, nowadays they have also found application in material …