On the motion of hairy black holes in Einstein-Maxwell-dilaton theories

Starting from the static, spherically symmetric black hole solutions in massless Einstein-Maxwell-dilaton (EMD) theories, we build a "skeleton" action, that is, we phenomenologically replace black holes by an appropriate effective point particle action, which is well suited to the formal treatment of the many-body problem in EMD theories. We find that, depending crucially on the value of their scalar cosmological environment, black holes can undergo steep "scalarization" transitions, inducing large deviations to the general relativistic two-body dynamics, as shown, for example, when computing the first post-Keplerian Lagrangian of EMD theories

Investigations into Ruthenium Metathesis Catalysts with Six-Membered Chelating NHC Ligands: Relationship between Catalyst Structure and Stereoselectivity

A series of ruthenium catalysts bearing five-membered chelating NHC architectures that exhibit very high <i>Z</i>-selectivity in a variety of metathesis reactions have recently been reported. It was envisioned that catalysts possessing six-membered chelates could similarly exhibit high <i>Z</i>-selectivity and address limitations of this methodology. We thus prepared a number of new catalysts and systematically investigated the impact of the NHC and anionic ligand on their stereoselectivity. In standard metathesis assays, only catalysts containing six-membered chelated NHC structures and η²-bound anionic ligands favored the <i>Z</i>-olefin products. In addition, substitution with bulkier <i>N</i>-aryl groups led to improved <i>Z</i>-selectivity. The effect of ligand structure on stereoselectivity discovered in this study will be useful in the future design of highly active and <i>Z</i>-selective ruthenium catalysts

Investigations into Ruthenium Metathesis Catalysts with Six-Membered Chelating NHC Ligands: Relationship between Catalyst Structure and Stereoselectivity

A series of ruthenium catalysts bearing five-membered chelating NHC architectures that exhibit very high <i>Z</i>-selectivity in a variety of metathesis reactions have recently been reported. It was envisioned that catalysts possessing six-membered chelates could similarly exhibit high <i>Z</i>-selectivity and address limitations of this methodology. We thus prepared a number of new catalysts and systematically investigated the impact of the NHC and anionic ligand on their stereoselectivity. In standard metathesis assays, only catalysts containing six-membered chelated NHC structures and η²-bound anionic ligands favored the <i>Z</i>-olefin products. In addition, substitution with bulkier <i>N</i>-aryl groups led to improved <i>Z</i>-selectivity. The effect of ligand structure on stereoselectivity discovered in this study will be useful in the future design of highly active and <i>Z</i>-selective ruthenium catalysts

Investigations into Ruthenium Metathesis Catalysts with Six-Membered Chelating NHC Ligands: Relationship between Catalyst Structure and Stereoselectivity

A series of ruthenium catalysts bearing five-membered chelating NHC architectures that exhibit very high <i>Z</i>-selectivity in a variety of metathesis reactions have recently been reported. It was envisioned that catalysts possessing six-membered chelates could similarly exhibit high <i>Z</i>-selectivity and address limitations of this methodology. We thus prepared a number of new catalysts and systematically investigated the impact of the NHC and anionic ligand on their stereoselectivity. In standard metathesis assays, only catalysts containing six-membered chelated NHC structures and η²-bound anionic ligands favored the <i>Z</i>-olefin products. In addition, substitution with bulkier <i>N</i>-aryl groups led to improved <i>Z</i>-selectivity. The effect of ligand structure on stereoselectivity discovered in this study will be useful in the future design of highly active and <i>Z</i>-selective ruthenium catalysts

Investigations into Ruthenium Metathesis Catalysts with Six-Membered Chelating NHC Ligands: Relationship between Catalyst Structure and Stereoselectivity

A series of ruthenium catalysts bearing five-membered chelating NHC architectures that exhibit very high <i>Z</i>-selectivity in a variety of metathesis reactions have recently been reported. It was envisioned that catalysts possessing six-membered chelates could similarly exhibit high <i>Z</i>-selectivity and address limitations of this methodology. We thus prepared a number of new catalysts and systematically investigated the impact of the NHC and anionic ligand on their stereoselectivity. In standard metathesis assays, only catalysts containing six-membered chelated NHC structures and η²-bound anionic ligands favored the <i>Z</i>-olefin products. In addition, substitution with bulkier <i>N</i>-aryl groups led to improved <i>Z</i>-selectivity. The effect of ligand structure on stereoselectivity discovered in this study will be useful in the future design of highly active and <i>Z</i>-selective ruthenium catalysts

Investigations into Ruthenium Metathesis Catalysts with Six-Membered Chelating NHC Ligands: Relationship between Catalyst Structure and Stereoselectivity

A series of ruthenium catalysts bearing five-membered chelating NHC architectures that exhibit very high <i>Z</i>-selectivity in a variety of metathesis reactions have recently been reported. It was envisioned that catalysts possessing six-membered chelates could similarly exhibit high <i>Z</i>-selectivity and address limitations of this methodology. We thus prepared a number of new catalysts and systematically investigated the impact of the NHC and anionic ligand on their stereoselectivity. In standard metathesis assays, only catalysts containing six-membered chelated NHC structures and η²-bound anionic ligands favored the <i>Z</i>-olefin products. In addition, substitution with bulkier <i>N</i>-aryl groups led to improved <i>Z</i>-selectivity. The effect of ligand structure on stereoselectivity discovered in this study will be useful in the future design of highly active and <i>Z</i>-selective ruthenium catalysts

Investigations into Ruthenium Metathesis Catalysts with Six-Membered Chelating NHC Ligands: Relationship between Catalyst Structure and Stereoselectivity

A series of ruthenium catalysts bearing five-membered chelating NHC architectures that exhibit very high <i>Z</i>-selectivity in a variety of metathesis reactions have recently been reported. It was envisioned that catalysts possessing six-membered chelates could similarly exhibit high <i>Z</i>-selectivity and address limitations of this methodology. We thus prepared a number of new catalysts and systematically investigated the impact of the NHC and anionic ligand on their stereoselectivity. In standard metathesis assays, only catalysts containing six-membered chelated NHC structures and η²-bound anionic ligands favored the <i>Z</i>-olefin products. In addition, substitution with bulkier <i>N</i>-aryl groups led to improved <i>Z</i>-selectivity. The effect of ligand structure on stereoselectivity discovered in this study will be useful in the future design of highly active and <i>Z</i>-selective ruthenium catalysts

Investigations into Ruthenium Metathesis Catalysts with Six-Membered Chelating NHC Ligands: Relationship between Catalyst Structure and Stereoselectivity

A series of ruthenium catalysts bearing five-membered chelating NHC architectures that exhibit very high <i>Z</i>-selectivity in a variety of metathesis reactions have recently been reported. It was envisioned that catalysts possessing six-membered chelates could similarly exhibit high <i>Z</i>-selectivity and address limitations of this methodology. We thus prepared a number of new catalysts and systematically investigated the impact of the NHC and anionic ligand on their stereoselectivity. In standard metathesis assays, only catalysts containing six-membered chelated NHC structures and η²-bound anionic ligands favored the <i>Z</i>-olefin products. In addition, substitution with bulkier <i>N</i>-aryl groups led to improved <i>Z</i>-selectivity. The effect of ligand structure on stereoselectivity discovered in this study will be useful in the future design of highly active and <i>Z</i>-selective ruthenium catalysts

Investigations into Ruthenium Metathesis Catalysts with Six-Membered Chelating NHC Ligands: Relationship between Catalyst Structure and Stereoselectivity

A series of ruthenium catalysts bearing five-membered chelating NHC architectures that exhibit very high <i>Z</i>-selectivity in a variety of metathesis reactions have recently been reported. It was envisioned that catalysts possessing six-membered chelates could similarly exhibit high <i>Z</i>-selectivity and address limitations of this methodology. We thus prepared a number of new catalysts and systematically investigated the impact of the NHC and anionic ligand on their stereoselectivity. In standard metathesis assays, only catalysts containing six-membered chelated NHC structures and η²-bound anionic ligands favored the <i>Z</i>-olefin products. In addition, substitution with bulkier <i>N</i>-aryl groups led to improved <i>Z</i>-selectivity. The effect of ligand structure on stereoselectivity discovered in this study will be useful in the future design of highly active and <i>Z</i>-selective ruthenium catalysts

Decomposition Pathways of <i>Z</i>-Selective Ruthenium Metathesis Catalysts

The decomposition of a <i>Z</i>-selective ruthenium metathesis catalyst and structurally similar analogues has been investigated utilizing X-ray crystallography and density functional theory. Isolated X-ray crystal structures suggest that recently reported C–H activated catalysts undergo decomposition via insertion of the alkylidene moiety into the chelating ruthenium–carbon bond followed by hydride elimination, which is supported by theoretical calculations. The resulting ruthenium hydride intermediates have been implicated in previously observed olefin migration, and thus lead to unwanted byproducts in cross metathesis reactions. Preventing these decomposition modes will be essential in the design of more active and selective <i>Z</i>-selective catalysts