Aromaticity in catalysis: metal ligand cooperation <i>via</i> ligand dearomatization and rearomatization

Metal-ligand cooperation by aromatization-dearomatization as a tool in single bond activation.

Metal-ligand cooperation (MLC) plays an important role in bond activation processes, enabling many chemical and biological catalytic reactions. A recent new mode of activation of chemical bonds involves ligand aromatization-dearomatization processes in pyridine-based pincer complexes in which chemical bonds are broken reversibly across the metal centre and the pincer-ligand arm, leading to new ...

Supramolecular catalysis in metal-ligand cluster hosts.

Cr-Cr Quintuple Bonds: Ligand Topology and Interplay Between Metal-Metal and Metal-Ligand Bonding.

Chromium-chromium quintuple bonds seem to be approaching the lower limit for their bond distances, and this computational density functional theory study tries to explore the geometrical and electronic factors that determine that distance and to find ways to fine-tune it via the ligand choice. While for monodentate ligands the Cr-Cr distance is predicted to shorten as the Cr-Cr-L bond angle inc...

Asymmetric Catalysis: Ligand Design and Conformational Studies

This thesis deals with the design of ligands for efficient asymmetric catalysis and studies of the conformation of the ligands in the catalytically active complexes. All ligands developed contain chiral oxazoline heterocycles. The conformations of hydroxyand methoxy-substituted pyridinooxazolines and bis(oxazolines) during Pd-catalysed allylic alkylations were investigated using crystallography...

Ligand effects in homogeneous Au catalysis.

ion agent (entry 4). Echavarren examined the intramolecular hydroarylation of alkynes with indoles, observing that the regioselectivity (formal 7-exo-dig vs 8-endo-dig) of the cyclization is highly dependent upon the catalytic Au source (Table 8). In the cyclization of 37, Ph3PAuCl/AgSbF6 resulted in little discrimination between the pathways leading to 38 and 39 (entry 4). Remarkably, AuCl and...