The Aqueous Ring-Opening Metathesis Polymerization of Furan-Maleic Anhydride Adduct: Increased Catalytic Activity Using a Recyclable Transition Metal Catalyst

1993 ◽  
Vol 70 (2) ◽  
pp. 165 ◽  
Author(s):  
Tito Viswanathan ◽  
Jagdish Jethmalani
Keyword(s):  
Catalytic Activity ◽  
Transition Metal ◽  
Maleic Anhydride ◽  
Ring Opening ◽  
Metal Catalyst ◽  
Ring Opening Metathesis Polymerization ◽  
Transition Metal Catalyst ◽  
Metathesis Polymerization

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>

In situ reduction of well-dispersed nickel nanoparticles on hierarchical nickel silicate hollow nanofibers as a highly efficient transition metal catalyst

RSC Advances ◽  
2016 ◽  
Vol 6 (39) ◽  
pp. 32580-32585 ◽  
Author(s):  
Yang Yang ◽  
Renxi Jin ◽  
Shuo Zhao ◽  
Jihong Liu ◽  
Yunfeng Li ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Transition Metal ◽  
Nickel Nanoparticles ◽  
Metal Catalyst ◽  
Ni Nanoparticles ◽  
In Situ Reduction ◽  
Hollow Nanofibers ◽  
Transition Metal Catalyst ◽  
Nickel Silicate

Ni nanoparticles were immobilized on the hierarchically double-shell nickel silicate hollow nanofibers, the composites exhibited an excellent catalytic activity.

DBU-promoted ring-opening reactions of multi-substituted donor–acceptor cyclopropanes: access to functionalized chalcones with a quaternary carbon group

2020 ◽  
Vol 18 (45) ◽  
pp. 9210-9215
Author(s):  
Naili Luo ◽  
Jiamin Liu ◽  
Shan Wang ◽  
Cunde Wang
Keyword(s):  
Transition Metal ◽  
Ring Opening ◽  
Metal Catalyst ◽  
Quaternary Carbon ◽  
Transition Metal Catalyst ◽  
Ring Opening Reactions ◽  
Donor Acceptor

A strategy to synthesize highly stereoselective chalcones with alkylcyanoacetate subunits via DBU-promoted ring-opening reactions of multi-substituted D–A cyclopropanes has been developed without the requirement of a transition metal catalyst and extra solvent.

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.

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