Blar i Bergen Open Research Archive på forfatter "Törnroos, Karl Wilhelm"
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Bis(Phenolate)-Functionalized N-Heterocyclic Carbene Complexes of Oxo- and Imido-Vanadium(V)
Suresh, Lakshmi; Finnestad, Jone; Törnroos, Karl Wilhelm; Le Roux, Erwan (Journal article; Peer reviewed, 2021)Oxo- and imido-vanadium(V) metal complexes supported by bis(phenolate)-functionalized N-heterocyclic carbene (NHC) ligands were synthesized and structurally identified. In the presence of [(Ph3P=)2N]Cl ([PPN]Cl), saturated ... -
C–H-Bond Activation and Isoprene Polymerization Studies Applying Pentamethylcyclopentadienyl-Supported Rare-Earth-Metal Bis(Tetramethylaluminate) and Dimethyl Complexes
Hollfelder, Christoph O.; Meermann-Zimmermann, Melanie; Spiridopoulos, Georgios; Werner, Daniel; Törnroos, Karl Wilhelm; Maichle-Mössmer, Cäcilia; Anwander, Reiner (Peer reviewed; Journal article, 2019)As previously shown for lutetium and yttrium, 1,2,3,4,5-pentamethylcyclopentadienyl (C5Me5 = Cp*)-bearing rare-earth metal dimethyl half-sandwich complexes [Cp*LnMe2]3 are now also accessible for holmium, dysprosium, and ... -
Loss and Reformation of Ruthenium Alkylidene: Connecting Olefin Metathesis, Catalyst Deactivation, Regeneration, and Isomerization
Engel, Julien; Smit, Wietse; Foscato, Marco; Occhipinti, Giovanni; Törnroos, Karl Wilhelm; Jensen, Vidar Remi (Peer reviewed; Journal article, 2017)Ruthenium-based olefin metathesis catalysts are used in laboratory-scale organic synthesis across chemistry, largely thanks to their ease of handling and functional group tolerance. In spite of this robustness, these ... -
Nanoscale organolanthanum clusters: Nuclearity-directing role of cyclopentadienyl and halogenido ligands
Buschmann, Dennis A.; Dietrich, H. Martin; Schneider, David; Birkelbach, Verena M.; Stuhl, Christoph; Törnroos, Karl Wilhelm; Maichle-Mössmer, Cäcilia; Anwander, Reiner (Journal article; Peer reviewed, 2020)Tetramethylaluminato/halogenido(X) ligand exchange reactions in half-sandwich complexes [CpRLa(AlMe4)2] are feasible in non-coordinating solvents and provide access to large coordination clusters of the type [CpRLaX2]x. ... -
Phosphine-Based Z‑Selective Ruthenium Olefin Metathesis Catalysts
Smit, Wietse; Koudriavtsev, Vitali; Occhipinti, Giovanni; Törnroos, Karl Wilhelm; Jensen, Vidar Remi (Peer reviewed; Journal article, 2016-05-18)Whereas a number of highly Z-selective ruthenium-based olefin metathesis catalysts bearing N-heterocyclic carbene ligands have been reported in recent years, Zselectivity has so far been difficult to achieve for phosphinebased ... -
Pyridine-Stabilized Fast-Initiating Ruthenium Monothiolate Catalysts for Z-Selective Olefin Metathesis
Occhipinti, Giovanni; Törnroos, Karl Wilhelm; Jensen, Vidar Remi (Peer reviewed; Journal article, 2017)Pyridine as a stabilizing donor ligand drastically improves the performance of ruthenium monothiolate catalysts for olefin metathesis in comparison with previous versions based on a stabilizing benzylidene ether ligand. ... -
Selective rearrangement of terminal epoxides into methylketones catalysed by a nucleophilic rhodium-NHC-pincer complex
Jurgens, Eva; Wucher, Barbara; Rominger, Frank; Törnroos, Karl Wilhelm; Kunz, Doris (Peer reviewed; Journal article, 2014-12-22)An efficient RhI–NHC–pincer catalyst for the highly regioselective Meinwald rearrangement of monoalkylated epoxides into methylketones under mild conditions is presented. The nucleophilic epoxide opening is assisted by ... -
Spin Crossover in a Hexaamineiron(II) Complex: Experimental Confirmation of a Computational Prediction
Bernhardt, Paul V.; Bilyj, Jessica K.; Brosius, Victor; Chernyshov, Dmitry; Deeth, Robert J.; Foscato, Marco; Jensen, Vidar Remi; Mertes, Nicole; Riley, Mark J.; Törnroos, Karl Wilhelm (Peer reviewed; Journal article, 2018-01-06)Single crystal structural analysis of [Fe^II(tame)_2]Cl_2⋅MeOH (tame=1,1,1‐tris(aminomethyl)ethane) as a function of temperature reveals a smooth crossover between a high temperature high‐spin octahedral d^6 state and a ... -
Toward E-selective Olefin Metathesis: Computational Design and Experimental Realization of Ruthenium Thio-Indolate Catalysts
Reim, Immanuel; Occhipinti, Giovanni; Törnroos, Karl Wilhelm; Fogg, Deryn E.; Jensen, Vidar Remi (Journal article; Peer reviewed, 2021)The selective transformation of 1-alkenes into E-olefins is a long-standing challenge in olefin metathesis. Density functional theory (DFT) calculations predict high E-selectivity for catalysts incorporating a bidentate, ... -
Unsaturated and Benzannulated N-Heterocyclic Carbene Complexes of Titanium and Hafnium: Impact on Catalysts Structure and Performance in Copolymerization of Cyclohexene Oxide with CO2
Suresh, Lakshmi; Ralte, Lalrempuia; Ekeli, Jonas Brattebø; Gillis-D'Hamers, Francis; Törnroos, Karl Wilhelm; Jensen, Vidar Remi; Le Roux, Erwan (Journal article; Peer reviewed, 2020)Tridentate, bis-phenolate N-heterocyclic carbenes (NHCs) are among the ligands giving the most selective and active group 4-based catalysts for the copolymerization of cyclohexene oxide (CHO) with CO2. In particular, ligands ... -
Z-Selective Monothiolate Ruthenium Indenylidene Olefin Metathesis Catalysts
Smit, Wietse; Ekeli, Jonas Brattebø; Occhipinti, Giovanni; Wozniak, Bartosz; Törnroos, Karl Wilhelm; Jensen, Vidar Remi (Journal article; Peer reviewed, 2020)Ru-alkylidenes bearing sterically demanding arylthiolate ligands (SAr) constitute one of only two classes of catalyst that are Z-selective in metathesis of 1-alkenes. Of particular interest are complexes bearing pyridine ...