scholarly journals Olefin metathesis in nano-sized systems

2011 ◽  
Vol 7 ◽  
pp. 94-103 ◽  
Author(s):  
Didier Astruc ◽  
Abdou K Diallo ◽  
Sylvain Gatard ◽  
Liyuan Liang ◽  
Cátia Ornelas ◽  
...  
Keyword(s):  
Olefin Metathesis ◽  
Covalent Attachment ◽  
Enyne Metathesis ◽  
Ring Closing Metathesis ◽  
Cross Metathesis ◽  
Metathesis Reactions ◽  
Nano Catalysts

The interplay between olefin metathesis and dendrimers and other nano systems is addressed in this mini review mostly based on the authors’ own contributions over the last decade. Two subjects are presented and discussed: (i) The catalysis of olefin metathesis by dendritic nano-catalysts via either covalent attachment (ROMP) or, more usefully, dendrimer encapsulation – ring closing metathesis (RCM), cross metathesis (CM), enyne metathesis reactions (EYM) – for reactions in water without a co-solvent and (ii) construction and functionalization of dendrimers by CM reactions.

scholarly journals The catalytic performance of Ru–NHC alkylidene complexes: PCy3 versus pyridine as the dissociating ligand

2010 ◽  
Vol 6 ◽  
pp. 1188-1198 ◽  
Author(s):  
Stefan Krehl ◽  
Diana Geißler ◽  
Sylvia Hauke ◽  
Oliver Kunz ◽  
Lucia Staude ◽  
...  
Keyword(s):  
Catalytic Performance ◽  
Enyne Metathesis ◽  
Pyridine Ligand ◽  
Ring Closing Metathesis ◽  
Similar Activity ◽  
Cross Metathesis ◽  
Pyridine Complex ◽  
Metathesis Reactions ◽  
Alkylidene Complexes

The catalytic performance of NHC-ligated Ru-indenylidene or benzylidene complexes bearing a tricyclohexylphosphine or a pyridine ligand in ring closing metathesis (RCM), cross metathesis, and ring closing enyne metathesis (RCEYM) reactions is compared. While the PCy3 complexes perform significantly better in RCM and RCEYM reactions than the pyridine complex, all catalysts show similar activity in cross metathesis reactions.

A simple and practical preparation of an efficient water soluble olefin metathesis catalyst

2015 ◽  
Vol 17 (6) ◽  
pp. 3407-3414 ◽  
Author(s):  
Zhen J. Wang ◽  
W. Roy Jackson ◽  
Andrea J. Robinson
Keyword(s):  
Olefin Metathesis ◽  
Water Soluble ◽  
Ring Closing Metathesis ◽  
Cross Metathesis ◽  
Metathesis Catalyst ◽  
Metathesis Reactions ◽  
Scale Preparation

A facile gram-scale preparation of a di-ammonium functionalised Ru-alkylidene complex which efficiently catalyses ring-closing metathesis and cross-metathesis reactions in water.

scholarly journals Latent ruthenium–indenylidene catalysts bearing a N-heterocyclic carbene and a bidentate picolinate ligand

2015 ◽  
Vol 11 ◽  
pp. 1541-1546 ◽  
Author(s):  
Thibault E Schmid ◽  
Florian Modicom ◽  
Adrien Dumas ◽  
Etienne Borré ◽  
Loic Toupet ◽  
...  
Keyword(s):  
Bronsted Acid ◽  
Brønsted Acid ◽  
Enyne Metathesis ◽  
Ring Closing Metathesis ◽  
Cross Metathesis ◽  
Brönsted Acid ◽  
Metathesis Reactions

A silver-free methodology was developed for the synthesis of unprecedented N-heterocyclic carbene ruthenium indenylidene complexes bearing a bidentate picolinate ligand. The highly stable (SIPr)(picolinate)RuCl(indenylidene) complex 4a (SIPr = 1,3-bis(2-6-diisopropylphenyl)imidazolidin-2-ylidene) demonstrated excellent latent behaviour in ring closing metathesis (RCM) reaction and could be activated in the presence of a Brønsted acid. The versatility of the catalyst 4a was subsequently demonstrated in RCM, cross-metathesis (CM) and enyne metathesis reactions.

scholarly journals Recent Advances in Total Synthesis via Metathesis Reactions

Synthesis ◽  
2018 ◽  
Vol 50 (19) ◽  
pp. 3749-3786 ◽  
Author(s):  
Francisco Sarabia ◽  
Iván Cheng-Sánchez
Keyword(s):  
Total Synthesis ◽  
Tandem Reactions ◽  
Alkyne Metathesis ◽  
Enyne Metathesis ◽  
Metathesis Reaction ◽  
Ring Closing Metathesis ◽  
Total Syntheses ◽  
Cross Metathesis ◽  
Carbon Carbon Bonds ◽  
Metathesis Reactions

The metathesis reactions, in their various versions, have become a powerful and extremely valuable tool for the formation of carbon–carbon bonds in organic synthesis. The plethora of available catalysts to perform these reactions, combined with the various transformations that can be accomplished, have positioned the metathesis processes as one of the most important reactions of this century. In this review, we highlight the most relevant synthetic contributions published between 2012 and early 2018 in the field of total synthesis, reflecting the state of the art of this chemistry and demonstrating the significant synthetic potential of these methodologies.1 Introduction2 Alkene Metathesis in Total Synthesis2.1 Total Synthesis Based on a Ring-Closing-Metathesis Reaction2.2 Total Synthesis Based on a Cross-Metathesis Reaction2.3 Strategies for Selective and Efficient Metathesis Reactions of Alkenes2.3.1 Temporary Tethered Ring-Closing Metathesis2.3.2 Relay Ring-Closing Metathesis2.3.3 Stereoselective Alkene Metathesis2.3.4 Alkene Metathesis in Tandem Reactions3 Enyne Metathesis in Total Synthesis3.1 Total Syntheses Based on a Ring-Closing Enyne-Metathesis Reaction3.2 Total Syntheses Based on an Enyne Cross-Metathesis Reaction3.3 Enyne Metathesis in Tandem Reactions4 Alkyne Metathesis in Total Synthesis4.1 Total Synthesis Based on a Ring-Closing Alkyne-Metathesis Reaction4.2 Other Types of Alkyne-Metathesis Reactions5 Conclusions

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.

One-Pot Ring-Closing Metathesis-Alkene Cross Metathesis Reactions of Sulfamide-Linked Enynes

2004 ◽  
Vol 2004 (4) ◽  
pp. 800-806 ◽  
Author(s):  
Sofia S. Salim ◽  
Richard K. Bellingham ◽  
Richard C. D. Brown
Keyword(s):  
Ring Closing Metathesis ◽  
One Pot ◽  
Cross Metathesis ◽  
Metathesis Reactions

scholarly journals Recent Advances in the Application of Ring-Closing Metathesis for the Synthesis of Unsaturated Nitrogen Heterocycles

Synthesis ◽  
2019 ◽  
Vol 51 (05) ◽  
pp. 1100-1114 ◽  
Author(s):  
Emilia Groso ◽  
Corinna Schindler
Keyword(s):  
Olefin Metathesis ◽  
Nitrogen Heterocycles ◽  
Short Review ◽  
Catalyst Design ◽  
Carbene Ligands ◽  
Ring Closing Metathesis ◽  
Recent Advances ◽  
Metathesis Reactions

This short review summarizes recent advances relating to the application of ring-closing olefin-olefin and carbonyl-olefin metathesis reactions towards the synthesis of unsaturated five- and six-membered nitrogen heterocycles. These developments include catalyst modifications and reaction designs that will enable access to more complex nitrogen heterocycles.1 Introduction2 Expansion of Ring-Closing Metathesis Methods3 Evaluation of Catalyst Design4 Indenylidene Catalysts5 Unsymmetrical N-Heterocyclic Carbene Ligands6 Carbonyl-Olefin Metathesis7 Conclusions

Selective Domino Ring-Closing Metathesis−Cross-Metathesis Reactions between Enynes and Electron-Deficient Alkenes

2003 ◽  
Vol 5 (11) ◽  
pp. 2007-2009 ◽  
Author(s):  
Frédérique Royer ◽  
Claire Vilain ◽  
Laurent Elkaïm ◽  
Laurence Grimaud
Keyword(s):  
Ring Closing Metathesis ◽  
Cross Metathesis ◽  
Metathesis Reactions

One-Pot Ring-Closing Metathesis-Alkene Cross Metathesis Reactions of Sulfamide-Linked Enynes.

ChemInform ◽  
2004 ◽  
Vol 35 (25) ◽  
Author(s):  
Sofia S. Salim ◽  
Richard K. Bellingham ◽  
Richard C. D. Brown
Keyword(s):  
Ring Closing Metathesis ◽  
One Pot ◽  
Cross Metathesis ◽  
Metathesis Reactions

scholarly journals New library of aminosulfonyl-tagged Hoveyda–Grubbs type complexes: Synthesis, kinetic studies and activity in olefin metathesis transformations

2010 ◽  
Vol 6 ◽  
pp. 1159-1166 ◽  
Author(s):  
Etienne Borré ◽  
Frederic Caijo ◽  
Christophe Crévisy ◽  
Marc Mauduit
Keyword(s):  
Olefin Metathesis ◽  
Kinetic Studies ◽  
Ring Closing Metathesis ◽  
Good Tolerance ◽  
Cross Metathesis ◽  
Activity Enhancement ◽  
Selection Of

Seven novel Hoveyda–Grubbs precatalysts bearing an aminosulfonyl function are reported. Kinetic studies indicate an activity enhancement compared to Hoveyda’s precatalyst. A selection of these catalysts was investigated with various substrates in ring-closing metathesis of dienes or enynes and cross metathesis. The results demonstrate that these catalysts show a good tolerance to various chemical functions.

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