Cyclohexene Oxide/CO2Copolymerization Catalyzed by Chromium(III) Salen Complexes andN-Methylimidazole:  Effects of Varying Salen Ligand Substituents and Relative Cocatalyst Loading

2004 ◽  
Vol 43 (19) ◽  
pp. 6024-6034 ◽  
Author(s):  
Donald. J. Darensbourg ◽  
Ryan M. Mackiewicz ◽  
Jody L. Rodgers ◽  
Cindy C. Fang ◽  
Damon R. Billodeaux ◽  
...  
Keyword(s):  
Cyclohexene Oxide ◽  
Salen Complexes ◽  
Salen Ligand

Synthesis and application of Co(salen) complexes containing proximal imidazolium ionic liquid cores

2012 ◽  
Vol 90 (1) ◽  
pp. 60-70 ◽  
Author(s):  
Swapnil Sonar ◽  
Kenson Ambrose ◽  
Arthur D. Hendsbee ◽  
Jason D. Masuda ◽  
Robert D. Singer
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Model Compound ◽  
Veratryl Alcohol ◽  
Oxidation Catalysts ◽  
Imidazolium Ionic Liquid ◽  
Lignin Model Compound ◽  
Salen Complexes ◽  
Lignin Model ◽  
Salen Ligand

Ionic ligands derived from a salen ligand containing two proximal 1,3-disubstituted imidazolium ionic liquid cores form cobalt(III) complexes capable of selectively oxidizing veratryl alcohol, a lignin model compound, to veratraldehyde using air as the source of oxygen. These complexes are easy to prepare, inexpensive, water stable, and soluble in ionic liquids, making them viable candidates for use as oxidation catalysts.

Salen ligand complexes as electrocatalysts for direct electrochemical reduction of gaseous carbon dioxide to value added products

RSC Advances ◽  
2015 ◽  
Vol 5 (5) ◽  
pp. 3581-3589 ◽  
Author(s):  
Surya Singh ◽  
Bedika Phukan ◽  
Chandan Mukherjee ◽  
Anil Verma
Keyword(s):  
Carbon Dioxide ◽  
Electrochemical Reduction ◽  
Value Added ◽  
Salen Complexes ◽  
Gaseous Carbon Dioxide ◽  
Salen Ligand ◽  
Centrosymmetric Molecule ◽  
Value Added Products

CO2, being a linear and centrosymmetric molecule, is very stable, and the electrochemical reduction of CO2 requires energy. However, the salen complexes are found to be very efficient to minimize overpotential as compared to their metal counterparts.

scholarly journals Synthesis, Characterisation and Cytotoxic Activity Evaluation of New Metalsalen Complexes Based on the 1,2-bicyclo[2.2.2]octane Bridge

2020 ◽  
Author(s):  
Pierre Milbeo ◽  
François Quintin ◽  
Laure Moulat ◽  
Claude Didierjean ◽  
Jean Martinez ◽  
...  
Keyword(s):  
Cytotoxic Activity ◽  
Ball Mill ◽  
Hct116 Cell ◽  
High Yield ◽  
Cytotoxic Activities ◽  
Salen Complex ◽  
Salen Complexes ◽  
Preparation Route ◽  
The One ◽  
Salen Ligand

Diaminobicyclo[2.2.2]octane was used as starting material for the preparation, in solution or in a ball-mill, of a salen ligand. Five metal salen complexes were prepared in high yield and their cytotoxic activities were evaluated against HCT116 cell lines. Original manganese salen complex displayed the highest activity with a potency 16 fold higher than the one of cisplatin, demonstrating the benefit of the bridging backbone, compared to other salen systems. An alternative preparation route for this complex by mechanochemistry was also performed.<br>

Zinc and iron complexes of a helix-directing (1R,2R)-cyclohexyl salen ligand with phenanthryl sidearms

2009 ◽  
Vol 87 (1) ◽  
pp. 224-231 ◽  
Author(s):  
Alexander V Wiznycia ◽  
John Desper ◽  
Christopher J Levy
Keyword(s):  
Metal Complexes ◽  
Iron Complexes ◽  
Single Species ◽  
Nmr Data ◽  
Salen Complexes ◽  
Dft Simulations ◽  
Helical Molecules ◽  
Salen Ligand ◽  
C Nmr

A symmetrical salen ligand is formed by the condensation of (1R,2R)-diaminocyclohexane with 4-hydroxy-3-phenanthrenecarboxaldehyde. Crystallographic characterization of the metal complexes (ZnII, FeII, and FeIII) show 1:1 mixtures of diastereomeric M and P helical molecules. ECD spectra of the ZnII complex combined with DFT simulations strongly suggest that the M conformation is dominant in solution. This is supported by 1H and 13C NMR data, which are consistent with a single species in solution.Key words: zinc, iron, ECD, DFT, salen complexes.

Asymmetric Alkene Epoxidation with Chromium Oxo Salen Complexes. A Systematic Study of Salen Ligand Substituents

2001 ◽  
Vol 3 (22) ◽  
pp. 3435-3438 ◽  
Author(s):  
Colm P. O'Mahony ◽  
Eoghan M. McGarrigle ◽  
Marie F. Renehan ◽  
Kenneth M. Ryan ◽  
Nessan J. Kerrigan ◽  
...  
Keyword(s):  
Systematic Study ◽  
Salen Complexes ◽  
Salen Ligand

Alternating ring-opening copolymerization of cyclohexene oxide with phthalic anhydride catalyzed by iron(III) salen complexes

2015 ◽  
Vol 23 (2) ◽  
pp. 161-166 ◽  
Author(s):  
Robert Mundil ◽  
Zdeněk Hošt’álek ◽  
Ivana Šeděnková ◽  
Jan Merna
Keyword(s):  
Phthalic Anhydride ◽  
Ring Opening ◽  
Cyclohexene Oxide ◽  
Salen Complexes

Direct Synthesis of Diphenyl Carbonate from Phenol and Carbon Dioxide Over Ti-Salen-Based Catalysts

2015 ◽  
Vol 15 (10) ◽  
pp. 8353-8358 ◽  
Author(s):  
Ki Hyuk Kang ◽  
Jin Oh Jun ◽  
Seung Ju Han ◽  
Kihyeok Kwon ◽  
O-Sung Kwon ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Direct Synthesis ◽  
Metal Species ◽  
Acid Property ◽  
Central Metal Atom ◽  
Diphenyl Carbonate ◽  
Central Metal ◽  
Salen Complexes ◽  
Enhanced Solubility ◽  
Salen Ligand

Various metal-salen catalysts were prepared for use in the direct synthesis of diphenyl carbonate (DPC) from phenol and carbon dioxide. We found that metal-salen complexes containing titanium as central metal species retained suitable Lewis acid property for the reaction. It was revealed that the catalytic activity of Ti-salen complexes could be controlled by introducing appropriate substituents into salen ligand. Insertion of phosphonium salts into para-position of aromatic aldehyde of salen ligand enhanced solubility of the catalyst in the methanol-phenol solution, and tert-butyl substituent in the salen ligand induced selective formation of DPC due to steric effect. In addition, introduction of various bridging groups into salen ligand caused change in electronic property of central metal atom. Among the catalysts tested, Ti-(t-butyl)salphen(PPh3)Cl showed the best catalytic performance at 100 °C and 60 bar. The catalytic system utilizing Ti-(t-butyl)salphen(PPh3)Cl catalyst was then optimized by conducting the reaction at various reaction temperatures and pressures.

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