Potassium fluoride activation for the nucleophilic fluorination reaction using 18-crown-6, [2.2.2]-cryptand, pentaethylene glycol and comparison with the new hydro-crown scaffold: a theoretical analysis

2018 ◽  
Vol 16 (17) ◽  
pp. 3127-3137 ◽  
Author(s):  
Josefredo R. Pliego
Keyword(s):  
Theoretical Analysis ◽  
Crown Ether ◽  
Potassium Fluoride ◽  
Ion Pair ◽  
Catalytic Cycle ◽  
Pentaethylene Glycol ◽  
Nucleophilic Fluorination

Ion-pair binding in the hydro-crown ether leads to more effective catalytic cycle for nucleophilic fluorination.

The extraction of alkali metal picrates by polyurethane foam using crown ether

1981 ◽  
Vol 59 (10) ◽  
pp. 1490-1496 ◽  
Author(s):  
Anjum S. Khan ◽  
W. G. Baldwin ◽  
A. Chow
Keyword(s):  
Crown Ether ◽  
Alkali Metal ◽  
Polyurethane Foam ◽  
Dissociation Constants ◽  
Extraction Constant ◽  
Ion Pair ◽  
Constant Sequence ◽  
Extraction Constants ◽  
The Stability ◽  
Ether Complex

The distribution of alkali metal picrates between water and polyurethane foam was studied in the presence of dicyclohexyl 18-crown-6 (DCHC-6). The extraction constants and dissociation constants for the ion pair (MCrA) in polyurethane foam were determined. The extraction constant sequence of the alkali metal ions with DCHC-6 is K+ > Rb+ > Cs+ > Na+ and mainly depends on the stability of the alkali metal – crown ether complex.

Micelle formation as a factor influencing the mode(s) of metal ion partitioning into N-alkylpyridinium-based ionic liquids (ILs): implications for the design of IL-based extraction systems

2017 ◽  
Vol 19 (23) ◽  
pp. 5674-5682 ◽  
Author(s):  
James L. Wankowski ◽  
Michael J. Kaul ◽  
Mark L. Dietz
Keyword(s):  
Ionic Liquids ◽  
Crown Ether ◽  
Metal Ion ◽  
Alkaline Earth ◽  
Micelle Formation ◽  
Ion Pair ◽  
Neutral Complex ◽  
Ion Partitioning ◽  
Alkaline Earth Cations ◽  
Complex Ion

In the extraction of alkali and alkaline earth cations by a crown ether into certain N-alkylpyridinium-based ILs, the balance between neutral complex/ion-pair partitioning and ion exchange is significantly altered by the formation of micelles in the aqueous phase involving the IL cation.

Ion Pair Cooperative Binding of Potassium Salts by New Rhenium(I) Bipyridine Crown Ether Receptors

2001 ◽  
Vol 40 (12) ◽  
pp. 2860-2869 ◽  
Author(s):  
Lindsay H. Uppadine ◽  
James E. Redman ◽  
Simon W. Dent ◽  
Michael G. B. Drew ◽  
Paul D. Beer
Keyword(s):  
Crown Ether ◽  
Ion Pair ◽  
Cooperative Binding ◽  
Potassium Salts

Ion-pair recognition based on halogen bonding: a case of the crown-ether receptor with iodo-trizole moiety

2017 ◽  
Vol 29 (2) ◽  
pp. 533-540 ◽  
Author(s):  
Li Zhou ◽  
Yunxiang Lu ◽  
Zhijian Xu ◽  
Changjun Peng ◽  
Honglai Liu
Keyword(s):  
Crown Ether ◽  
Halogen Bonding ◽  
Ion Pair

scholarly journals Effect of substituted phenolates as a counterion on the ion-pair extraction of alkali metal ions using crown ether

2003 ◽  
Vol 52 (9) ◽  
pp. 839-842 ◽  
Author(s):  
Haruyoshi NAKAGAWA ◽  
Naoki HIRAYAMA ◽  
Takaharu HONJO
Keyword(s):  
Crown Ether ◽  
Alkali Metal ◽  
Metal Ions ◽  
Ion Pair ◽  
Alkali Metal Ions
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