scholarly journals Synthesis and catalytic activity of supported acenaphthoimidazolylidene N-heterocyclic carbene ruthenium complex for ring closing metathesis (RCM) and ring opening metathesis polymerization (ROMP)

2016 ◽  
Vol 344 ◽  
pp. 100-107 ◽  
Author(s):  
Antsar R. Hlil ◽  
Salvador Moncho ◽  
Robert Tuba ◽  
Khaled Elsaid ◽  
Györgyi Szarka ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Ring Opening ◽  
Ruthenium Complex ◽  
Ring Opening Metathesis Polymerization ◽  
Ring Closing Metathesis ◽  
Metathesis Polymerization

Crosslinked dendronized polyols as a general approach to brighter and more stable fluorophores

2016 ◽  
Vol 52 (19) ◽  
pp. 3781-3784 ◽  
Author(s):  
Ying Li ◽  
Yugang Bai ◽  
Nan Zheng ◽  
Yang Liu ◽  
Gretchen A. Vincil ◽  
...  
Keyword(s):  
Ring Opening ◽  
Sequential Process ◽  
Chain Ring ◽  
Ring Opening Metathesis Polymerization ◽  
Ring Closing Metathesis ◽  
Metathesis Polymerization

Fluorescent, aqueous-soluble, crosslinked dendronized polyols (CDPs) are obtained through a sequential process involving ring-opening metathesis polymerization (ROMP), intra-chain ring-closing metathesis (RCM), and hydrolysis.

SBA-15 Immobilized Ruthenium Carbenes as Catalysts for Ring Closing Metathesis and Ring Opening Metathesis Polymerization

2009 ◽  
Vol 53 (3-4) ◽  
pp. 200-209 ◽  
Author(s):  
David Bek ◽  
Naděžda Žilková ◽  
Jiří Dědeček ◽  
Jan Sedláček ◽  
Hynek Balcar
Keyword(s):  
Ring Opening ◽  
Ring Opening Metathesis Polymerization ◽  
Ring Closing Metathesis ◽  
Metathesis Polymerization ◽  
Ruthenium Carbenes

Mechanosynthesis of Noels-type NHC-Ruthenium Complexes and Applications in ROMP

2019 ◽  
Author(s):  
François Quintin ◽  
Julien Pinaud ◽  
Frédéric Lamaty ◽  
Xavier Bantreil
Keyword(s):  
Catalytic Activity ◽  
Ring Opening ◽  
Ruthenium Complexes ◽  
High Catalytic Activity ◽  
Imidazolium Salts ◽  
Ring Opening Metathesis Polymerization ◽  
Ball Mills ◽  
Metathesis Polymerization ◽  
Rapid Access ◽  
The One

The use of ball-mills enabled the efficient mechanosynthesis of a variety of N-aryl,N-alkyl imidazolium salts and of corresponding NHC-silver(I) complexes. Transmetalation with ruthenium via mechanochemistry allowed the rapid access (1.5 min to 1 h) to complexes having a similar structure to Noels-type precatalysts. Evaluation of the complexes in the Ring-Opening Metathesis Polymerization of norbornene in different solvent, including non-toxic ones, showed a high catalytic activity for one of them, comparable to the one of Noels catalyst.<br>

scholarly journals Synthesis of highly stable dual-site immobilized ruthenium olefin metathesis catalyst without ru leaching

2021 ◽  
Vol 2131 (4) ◽  
pp. 042055
Author(s):  
Huanhuan Zhao ◽  
Yanwu Zhang
Keyword(s):  
Block Copolymer ◽  
Olefin Metathesis ◽  
Ring Opening ◽  
Ring Opening Metathesis Polymerization ◽  
Ring Closing Metathesis ◽  
Metathesis Polymerization ◽  
Immobilized Catalyst ◽  
Excellent Activity ◽  
Metathesis Catalyst ◽  
Dual Site

Abstract The tri-block copolymer is used as a carrier to simultaneously immobilize the N-heterocyclic and benzylidene ligands precursor of the Ru-based catalyst to form a dual-site immobilized catalyst. The dual-site immobilized catalyst can catalyze ring-opening metathesis polymerization, ring-closing metathesis and self-metathesis. The dual-site immobilized catalyst shows good heterogeneity in dichloromethane, which simplifies the purification of product and recovery of catalyst. The dual-site immobilized catalyst exhibits excellent activity and recycling performance. The excellent recyclability can be attributed to the capture of ruthenium by the excess ligands precursor on carrier. Importantly, ruthenium residues are not detected in product.

Ring Opening Metathesis Polymerization of Norbornene by WCl6: Formation of WCl5 and WCl4 and Their Catalytic Activity

1996 ◽  
Vol 61 (9) ◽  
pp. 1353-1359 ◽  
Author(s):  
Hynek Balcar ◽  
Zdeněk Bastl
Keyword(s):  
Catalytic Activity ◽  
Ring Opening ◽  
Main Reaction ◽  
Reaction Products ◽  
Double Bonds ◽  
Ring Opening Metathesis Polymerization ◽  
Chlorine Atoms ◽  
Metathesis Polymerization ◽  
Xps Spectroscopy ◽  
Tungsten Species

Reaction between WCl6 and norbornene in benzene and cyclohexane, respectively, was investigated using UV/VIS, ESR and XPS spectroscopy in order to establish the main reaction products on the tungsten side and their relation to the initiation of ring opening metathesis polymerization (ROMP) of norbornene. The tungsten compounds: WCl5, insoluble WCl4 and soluble tungsten species having four chlorine atoms bound to tungsten, [WCl4Ln] were found to be the main products. The catalytic activity of the respective compounds in ROMP of norbornene was found to decrease in the order: WCl5 > WCl6 >> WCl4 ~ [WCl4Ln]. The polynorbornenes prepared with both WCl4 and [WCl4Ln] possess higher content of cis double bonds in comparison with polymers prepared with WCl6 and WCl5 catalysts.

Sign in / Sign up

Export Citation Format

Share Document