ESIMS Studies and Calculations on Alkali-Metal Adduct Ions of Ruthenium Olefin Metathesis Catalysts and Their Catalytic Activity in Metathesis Reactions

2009 ◽  
Vol 15 (41) ◽  
pp. 10948-10959 ◽  
Author(s):  
Hao-Yang Wang ◽  
Wai-Leung Yim ◽  
Thorsten Klüner ◽  
Jürgen O. Metzger
Keyword(s):  
Catalytic Activity ◽  
Alkali Metal ◽  
Olefin Metathesis ◽  
Metathesis Reactions ◽  
Metathesis Catalysts

scholarly journals Metathesis access to monocyclic iminocyclitol-based therapeutic agents

2011 ◽  
Vol 7 ◽  
pp. 699-716 ◽  
Author(s):  
Ileana Dragutan ◽  
Valerian Dragutan ◽  
Carmen Mitan ◽  
Hermanus CM Vosloo ◽  
Lionel Delaude ◽  
...  
Keyword(s):  
Olefin Metathesis ◽  
Metabolic Disorders ◽  
Therapeutic Agents ◽  
Comparative Performance ◽  
Common Diseases ◽  
Metathesis Reactions ◽  
Recent Developments ◽  
Metathesis Catalysts ◽  
Steric Control

By focusing on recent developments on natural and non-natural azasugars (iminocyclitols), this review bolsters the case for the role of olefin metathesis reactions (RCM, CM) as key transformations in the multistep syntheses of pyrrolidine-, piperidine- and azepane-based iminocyclitols, as important therapeutic agents against a range of common diseases and as tools for studying metabolic disorders. Considerable improvements brought about by introduction of one or more metathesis steps are outlined, with emphasis on the exquisite steric control and atom-economical outcome of the overall process. The comparative performance of several established metathesis catalysts is also highlighted.

scholarly journals Ruthenium indenylidene “1st generation” olefin metathesis catalysts containing triisopropyl phosphite

2015 ◽  
Vol 11 ◽  
pp. 1520-1527 ◽  
Author(s):  
Stefano Guidone ◽  
Fady Nahra ◽  
Alexandra M Z Slawin ◽  
Catherine S J Cazin
Keyword(s):  
Experimental Data ◽  
Thermal Stability ◽  
Olefin Metathesis ◽  
Synergistic Effects ◽  
Metathesis Reactions ◽  
Metathesis Catalysts ◽  
Ru Species

The reaction of triisopropyl phosphite with phosphine-based indenylidene pre-catalysts affords “1st generation” cis-complexes. These have been used in olefin metathesis reactions. The cis-Ru species exhibit noticeable differences with the trans-Ru parent complexes in terms of structure, thermal stability and reactivity. Experimental data underline the importance of synergistic effects between phosphites and L-type ligands.

Synthesis and characterization of non-chelating ruthenium–indenylidene olefin metathesis catalysts derived from substituted 1,1-diphenyl-2-propyn-1-ols

2015 ◽  
Vol 39 (3) ◽  
pp. 1858-1867 ◽  
Author(s):  
Baoyi Yu ◽  
Yu Xie ◽  
Fatma B. Hamad ◽  
Karen Leus ◽  
Alex A. Lyapkov ◽  
...  
Keyword(s):  
Olefin Metathesis ◽  
First Generation ◽  
Catalytic Performance ◽  
Ruthenium Catalysts ◽  
Synthesis And Characterization ◽  
Metathesis Reactions ◽  
Metathesis Catalysts

The synthesis and characterization of four first-generation modified non-chelating indenylidene ruthenium catalysts is reported, as well as their catalytic performance in olefin metathesis reactions.

Ammonium NHC-tagged olefin metathesis catalysts – influence of counter-ions on catalytic activity

2018 ◽  
Vol 42 (11) ◽  
pp. 8609-8614 ◽  
Author(s):  
Andrzej Tracz ◽  
Anna Gawin ◽  
Michał Bieniek ◽  
Tomasz K. Olszewski ◽  
Krzysztof Skowerski
Keyword(s):  
Catalytic Activity ◽  
Quaternary Ammonium ◽  
Olefin Metathesis ◽  
Counter Ions ◽  
Metathesis Catalysts

Ruthenium-based catalysts bearing quaternary ammonium groups in their N-heterocyclic carbene (NHC) fragments and different counter-ions were synthesised and tested in various olefin metathesis transformations.

scholarly journals The Influence of Various N-Heterocyclic Carbene Ligands on Activity of Nitro-Activated Olefin Metathesis Catalysts

Molecules ◽  
2020 ◽  
Vol 25 (10) ◽  
pp. 2282 ◽  
Author(s):  
Michał Pieczykolan ◽  
Justyna Czaban-Jóźwiak ◽  
Maura Malinska ◽  
Krzysztof Woźniak ◽  
Reto Dorta ◽  
...  
Keyword(s):  
High Activity ◽  
Olefin Metathesis ◽  
Double Bonds ◽  
Carbene Ligands ◽  
Grubbs Catalyst ◽  
Metathesis Reactions ◽  
Metathesis Catalysts

A set of nitro-activated ruthenium-based Hoveyda-Grubbs type olefin metathesis catalysts bearing sterically modified N-hetero-cyclic carbene (NHC) ligands have been obtained, characterised and studied in a set of model metathesis reactions. It was found that catalysts bearing standard SIMes and SIPr ligands (4a and 4b) gave the best results in metathesis of substrates with more accessible C–C double bonds. At the same time, catalysts bearing engineered naphthyl-substituted NHC ligands (4d–e) exhibited high activity towards formation of tetrasubstituted C–C double bonds, the reaction which was traditionally Achilles’ heel of the nitro-activated Hoveyda–Grubbs catalyst.

Synthesis and catalytic activity of ruthenium indenylidene complexes bearing unsymmetrical NHC containing a heteroaromatic moiety

RSC Advances ◽  
2016 ◽  
Vol 6 (80) ◽  
pp. 77013-77019 ◽  
Author(s):  
Michał Smoleń ◽  
Wioletta Kośnik ◽  
Rafał Loska ◽  
Roman Gajda ◽  
Maura Malińska ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Olefin Metathesis ◽  
Metathesis Reactions

New ruthenium(ii) indenylidene catalysts were synthesized and used in olefin metathesis reactions in toluene under air, leading to high conversions and good selectivities.

scholarly journals Halide exchanged Hoveyda-type complexes in olefin metathesis

2010 ◽  
Vol 6 ◽  
pp. 1091-1098 ◽  
Author(s):  
Julia Wappel ◽  
César A Urbina-Blanco ◽  
Mudassar Abbas ◽  
Jörg H Albering ◽  
Robert Saf ◽  
...  
Keyword(s):  
Olefin Metathesis ◽  
Ring Opening ◽  
Catalytic Performance ◽  
Ring Closing Metathesis ◽  
Cross Metathesis ◽  
Metathesis Reactions ◽  
Metathesis Catalysts

The aims of this contribution are to present a straightforward synthesis of 2nd generation Hoveyda-type olefin metathesis catalysts bearing bromo and iodo ligands, and to disclose the subtle influence of the different anionic co-ligands on the catalytic performance of the complexes in ring opening metathesis polymerisation, ring closing metathesis, enyne cycloisomerisation and cross metathesis reactions.

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