scholarly journals Cationic ruthenium alkylidene catalysts bearing phosphine ligands

2016 ◽  
Vol 45 (8) ◽  
pp. 3627-3634 ◽  
Author(s):  
Koji Endo ◽  
Robert H. Grubbs
Keyword(s):  
Ionic Liquid ◽  
Phosphine Ligands ◽  
New Class ◽  
Highly Active ◽  
Metathesis Catalysts

The discovery of highly active catalysts and the success of ionic liquid immobilized systems have accelerated attention to a new class of cationic metathesis catalysts.

A new class of conjugated ionic polyacetylene. Cyclopolymerization of dihexyldipropargylammonium salts by metathesis catalysts

1993 ◽  
Vol 26 (17) ◽  
pp. 4539-4543 ◽  
Author(s):  
Kil Lye Kang ◽  
Hyun Nam Cho ◽  
Kil Yeong Choi ◽  
Sam Kwon Choi ◽  
Sung Hyun Kim
Keyword(s):  
New Class ◽  
Metathesis Catalysts

Acceleration of Baylis-Hillman reaction using ionic liquid supported organocatalyst

2021 ◽  
Vol 08 ◽  
Author(s):  
Vivek Srivastava
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Reaction Rate ◽  
Reaction Medium ◽  
Catalyst Loading ◽  
Catalyst Recycling ◽  
Catalytic Systems ◽  
Heterogeneous Catalytic ◽  
Highly Active ◽  
Low Catalyst Loading

Background: Baylis-Hillman reaction suffers from the requirement of cheap starting materials, easy reaction protocol, possibility to create the chiral center in the reaction product has increased the synthetic efficacy of this reaction, and high catalyst loading, low reaction rate, and poor yield. Objective: The extensive use of various functional or non-functional ionic liquids (ILs) with organocatalyst increases the reaction rate of various organic transformations as a reaction medium and as a support to anchor the catalysts. Methods: In this manuscript, we have demonstrated the synthesis of quinuclidine-supported trimethylamine-based functionalized ionic liquid as a catalyst for the Baylis-Hillman reaction. Results: We obtained the Baylis-Hillman adducts in good, isolated yield, low catalyst loading, short reaction time, broad substrate scope, accessible product, and catalyst recycling. N-((E,3S,4R)-5-benzylidene-tetrahydro-4-hydroxy-6-oxo-2H-pyran-3-yl) palmitamide was also successfully synthesized using CATALYST-3 promoted Baylis-Hillman reaction. Conclusion: We successfully isolated the 25 types of Baylis-Hillman adducts using three different quinuclidine-supported ammonium-based ionic liquids such as Et3AmQ][BF4] (CATALYST-1), [Et3AmQ][PF6] (CATALYST-2), and [TMAAmEQ][NTf2](CATALYST-3) as new and efficient catalysts. Tedious and highly active N-((E,3S,4R)-5-benzylidene-tetrahydro-4-hydroxy-6-oxo-2H-pyran-3-yl) palmitamide derivative was also synthesized using CATALYST-3 followed by Baylis-Hillman reaction. Generally, all the responses demonstrated higher activity and yielded high competition with various previously reported homogenous and heterogeneous Catalytic systems. Easy catalyst and product recovery followed by six catalysts recycling were the added advantages of the prosed catalytic system.

scholarly journals A new class of platinum(ii) complexes with the phosphine ligand pta which show potent anticancer activity

2018 ◽  
Vol 5 (1) ◽  
pp. 39-53 ◽  
Author(s):  
M. D. Živković ◽  
J. Kljun ◽  
T. Ilic-Tomic ◽  
A. Pavic ◽  
A. Veselinović ◽  
...  
Keyword(s):  
Anticancer Activity ◽  
Phosphine Ligand ◽  
Phosphine Ligands ◽  
New Class

A series of 16 Pt(ii) complexes with 8-hydroxyquinolines and sulfoxide/phosphine ligands were synthetized, characterized and evaluated for cytotoxic and embryotoxic activity.

Merrifield resin-assisted routes to second-generation catalysts for olefin metathesis

2018 ◽  
Vol 8 (6) ◽  
pp. 1535-1544 ◽  
Author(s):  
Daniel L. Nascimento ◽  
Emma C. Davy ◽  
Deryn E. Fogg
Keyword(s):  
Olefin Metathesis ◽  
Second Generation ◽  
Highly Active ◽  
Merrifield Resin ◽  
Metathesis Catalysts

Phosphine-scavenging Merrifield resins can significantly facilitate the synthesis of highly active Ru metathesis catalysts, including the second-generation Grubbs, Hoveyda, and indenylidene catalysts (GII, HII, InII).

Magnetic Nanoparticles Supported Acidic Ionic Liquid as a Highly Active and Reusable Catalyst for Esterification

2016 ◽  
Vol 852 ◽  
pp. 485-488 ◽  
Author(s):  
Qiang Zhang ◽  
Xin Zhao ◽  
Xue Hua Zhu ◽  
Ji Hang Li
Keyword(s):  
Ionic Liquid ◽  
Catalytic Activity ◽  
Magnetic Nanoparticles ◽  
Catalytic Performance ◽  
Significant Loss ◽  
Reusable Catalyst ◽  
Hydrogen Sulfate ◽  
External Magnet ◽  
Acidic Ionic Liquid ◽  
Highly Active

A magnetic nanoparticles supported dual acidic ionic liquid catalyst was prepared via anchoring 3-sulfobutyl-1-(3-propyltriethoxysilane) imidazolium hydrogen sulfate onto the surface of silica-coated Fe3O4 nanoparticles. And this novel supported acidic ionic liquid catalyst showed good catalytic performance in esterification. More importantly, the catalyst could be easily recovered by an external magnet and reused six times without significant loss of catalytic activity.

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