Role of the Cocatalyst in the Copolymerization of CO2and Cyclohexene Oxide Utilizing Chromium Salen Complexes

2005 ◽  
Vol 127 (40) ◽  
pp. 14026-14038 ◽  
Author(s):  
Donald J. Darensbourg ◽  
Ryan M. Mackiewicz
Keyword(s):  
Cyclohexene Oxide ◽  
Salen Complexes

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

Asymmetric hydrolytic kinetic resolution with recyclable polymeric Co(iii)–salen complexes: a practical strategy in the preparation of (S)-metoprolol, (S)-toliprolol and (S)-alprenolol: computational rationale for enantioselectivity

2014 ◽  
Vol 4 (11) ◽  
pp. 3899-3908 ◽  
Author(s):  
Tamal Roy ◽  
Sunirmal Barik ◽  
Manish Kumar ◽  
Rukhsana I. Kureshy ◽  
Bishwajit Ganguly ◽  
...  
Keyword(s):  
Kinetic Resolution ◽  
Hydrolytic Kinetic Resolution ◽  
Salen Complexes ◽  
Practical Strategy

Role of chiral/achiral linker in asymmetric HKR of terminal epoxides using recyclable polymeric Co(iii) salen complexes.

scholarly journals Octahedral Co(III) salen complexes: the role of peripheral ligand electronics on axial ligand release upon reduction

2018 ◽  
Vol 96 (2) ◽  
pp. 110-118 ◽  
Author(s):  
Chen Zhang ◽  
Mathew Sutherland ◽  
Khrystyna Herasymchuk ◽  
Ryan M. Clarke ◽  
John R. Thompson ◽  
...  
Keyword(s):  
Ligand Exchange ◽  
Reduction Potential ◽  
Reduction Process ◽  
Axial Ligand ◽  
Lewis Acidity ◽  
Dominant Factor ◽  
Axial Ligands ◽  
Salen Complexes ◽  
Reducing Conditions

A series of octahedral CoIII salen complexes (where salen represents a N2O2 bis-Schiff-base bis-phenolate framework) were prepared with axial imidazole ligating groups. When using 1-methylimidazole (1-MeIm) axial ligands, the CoIII/CoII reduction potential could be altered by 220 mV via variation of the electron-donating ability of the para-ring substituents (R = H (1), OMe (2), tBu (3), Br (4), NO2 (5), and CF3 (6)). In addition, the irreversibility of the reduction process suggested substantial geometrical changes and axial ligand exchange upon reduction to the more labile CoII oxidation state. Installing an imidazole-coumarin conjugate as the axial ligands resulted in fluorescence quenching when bound to the CoIII centre (R = H (7), OMe (8), and CF3 (9)). The redox properties and fluorescence increase upon ligand release for 7–9 were studied under reducing conditions and in the presence of excess competing ligand (1-MeIm). It was determined that the Lewis acidity of the CoIII centre was the dominant factor in controlling axial ligand exchange for this series of complexes.

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

Role of dactinomycin in the improved survival of children with Wilms' tumor

JAMA ◽  
1966 ◽  
Vol 195 (12) ◽  
pp. 1005-1009 ◽  
Author(s):  
D. J. Fernbach
Keyword(s):  
Wilms Tumor
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