Results 81 to 90 of about 210,013 (270)
Solvent extraction of cesium by substituted crown ethers [PDF]
, 1996 The extraction of alkali metal nitrates by 18-crown-6, 21-crown-7, and 24-crown-8 ethers, bearing cyclohexano, benzo-, t-alkylbenzo, and furano- substituents, in 1,2-dichloroethane has been surveyed.
Sachleben, R. A. +3 more
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Chemistry – A European Journal, EarlyView.Regioisomerism rewires orbital topology and electronic polarity in curved non‐alternant π‐systems, switching both optical response and alkali metal ion recognition from Na+ to Rb+ selectivity. ABSTRACT Herein, we explore the fundamental concept of combining the molecular curvature of a molecular fragment of buckminsterfullerene with the pronounced ...
Jakub Cyniak +4 more
wiley +1 more source
Novel Tetramethoxy Resorcinarene Bis-Crown Ethers
, 2016 The synthesis and characterization of new tetramethoxy resorcinarene bis-crown ethers BC4 and BC5 are described. The complexation properties of the compounds toward alkali metal cations were studied by 1H NMR spectroscopy and X-ray crystallography, which
Maija Nissinen (1591750) +1 more
core +2 more sources
The synthesis and study of an amine functionalized crown ether
, 2004 This study has resulted in a route to the first known NHZ functionalized xylenebased crown ether, 5-amino-2-methoxy-1,3-xylyl-18-crown-5. The route involves preparing 5-azido-2-methoxy-1,3-xylyl-18-crown-5 from 5-bromo-2-methoxy-1,3-xylyl18-crown-5 by ...
Yonekawa, Sayuri
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Counterion Effects in Decatungstate Photocatalysis
European Journal of Organic Chemistry, EarlyView.Decatungstate photocatalysis is often discussed from an anion‐centered perspective, treating the counterion as a passive charge‐balancing species. This review highlights that counterion identity can instead profoundly influence catalyst solubility, ion pairing, aggregation, stability, substrate accessibility, and catalytic performance.
Florence Babawale +2 more
wiley +1 more source
Synthesis of neutral and proton-ionizable crown ethers
, 1990 Cyclization studies show that the CS2CO3 instigated reaction of the dimesylate of triethyleneglycol with 2,2'-bis[4(5)-tert-butyl-6- hydroxyphenoxy]-ethyl ether in MeCN is the best available method for preparation of sym-di[4(5)-tert-butylbenzo]-
McDonough, Joseph Aloysius
core +2 more sources
ChemistryOpenThe fluoride ion‐catalyzed selective O‐acylation of enol silyl ethers with acyl fluorides using KF and 18‐Crown‐6 is described herein. This catalytic system facilitated the practical and facile reaction of a variety of enol silyl ethers derived from ...
Prof. Dr. Norio Sakai +6 more
doaj +1 more source
Tris[(1,4,7,10,13,16-hexaoxacyclooctadecane)rubidium] heptaantimonide–ammonia (1/4)
Acta Crystallographica Section E, 2011 The crystal structure of the title compound, [Rb(C12H24O6)]3[Sb7]·4NH3, fills the gap between the already known Zintl anion ammoniates {[Cs(18-crown-6)]3Sb7}2·9NH3 [Wiesler (2007). Dissertation, Universität Regensburg, Germany]
Fabian Mutzbauer, Nikolaus Korber
doaj +1 more source
, 1920 Cover title: Lighting ware by Crown Crystal Glass Co.; Electronic reproduction. Canberra, A.C.T.
Crown Crystal Glass Co.
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Selective extraction of cesium using crown ethers [PDF]
, 1995 The fission product cesium-137, represents an environmental concern to U. S. Department of Energy and nuclear industry. Cesium- 137 though present in trace concentrations in various tanks, waste streams, soil and sediments, accounts for a major fraction ...
Batra, Anil Kumar
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