Synthesis and pKa determination of new enantiopure dimethyl-substituted acridino-crown ethers containing a carboxyl group: Useful candidates for enantiomeric recognition studies.
Sign Up to like & getrecommendations! Published in 2017 at "Chirality"
DOI: 10.1002/chir.22721
Abstract: New enantiopure dimethyl-substituted acridino-18-crown-6 and acridino-21-crown-7 ethers containing a carboxyl group at position 9 of the acridine ring [(S,S)-8, (S,S)-9, (R,R)-10] were synthesized. The pKa values of the new crown ethers [(S,S)-8, (S,S)-9, (R,R)-10] and… read more here.
Keywords: substituted acridino; dimethyl substituted; new enantiopure; enantiopure dimethyl ... See more keywords
Photochromic Crown Ethers
Sign Up to like & getrecommendations! Published in 2017 at "Russian Chemical Bulletin"
DOI: 10.1007/978-4-431-56544-4_17
Abstract: In this chapter, we demonstrated different strategies toward the construction of photochromic crown ethers in order to obtain the capability to recognize the chemical guest while retaining the photoswitchability. The complex formation in photochromic crown… read more here.
Keywords: photochromic crown; crown ethers;
Acylated and alkylated benzo(crown-ethers) form ion-dependent ion channels in biological membranes.
Sign Up to like & getrecommendations! Published in 2022 at "Biophysical journal"
DOI: 10.1016/j.bpj.2022.01.026
Abstract: Synthetic ion channels based on benzo(crown-ether) compounds have been previously reported to function as ion selective channels in planar lipid bilayers, with hydrogen bonding networks implicated in the formation of self-aggregated complexes. Herein, we report… read more here.
Keywords: ion channels; benzo crown; crown ethers; biological membranes ... See more keywords
Imparting low dielectric constant and high modulus to polyimides via synergy between coupled silsesquioxanes and crown ethers
Sign Up to like & getrecommendations! Published in 2017 at "Composites Science and Technology"
DOI: 10.1016/j.compscitech.2017.02.002
Abstract: Abstract Our pilot research revealed that the dielectric constant of polyimide (PI) can be reduced and the modulus can be improved by assembling necklace-like interlocking complexes with crown ethers. Not only did we find that… read more here.
Keywords: oaprs ce6; dielectric constant; ce6; modulus ... See more keywords
Experimental and theoretical investigations of Cs+ adsorption on crown ethers modified magnetic adsorbent.
Sign Up to like & getrecommendations! Published in 2019 at "Journal of hazardous materials"
DOI: 10.1016/j.jhazmat.2019.03.022
Abstract: Carboxyl Fe3O4 nanoparticles (Fe3O4@R-COOH) modified with 18-Crown-6 ether functional groups have been prepared via an amidation reaction and used as bifunctional adsorbent for Cs+. The adsorbent has a superparamagnetic property, allowing an easy recycling, and… read more here.
Keywords: crown ether; adsorption crown; adsorbent; experimental theoretical ... See more keywords
Synthesis and cytotoxicity of novel γ-piperidone-containing dibenzo-1,7-diaza-14-crown-4 ethers
Sign Up to like & getrecommendations! Published in 2019 at "Mendeleev Communications"
DOI: 10.1016/j.mencom.2019.07.004
Abstract: For the development of new antitumor agents, novel dibenzo-1,7-diaza-14-crown-4 ethers containing γ-piperidone moiety were synthesized by a domino condensation of new podands, ketones and ammonium acetate. The crystal structure of one Ts of them was… read more here.
Keywords: crown ethers; synthesis cytotoxicity; dibenzo diaza; piperidone ... See more keywords
Computational study for the electrophilic reactivity prediction of crown ethers
Sign Up to like & getrecommendations! Published in 2021 at "Journal of Molecular Liquids"
DOI: 10.1016/j.molliq.2021.117418
Abstract: Abstract Crown ethers are kinds of macrocyclic compounds with high selectivity to metal cations, which can be used as ion sensors, ion analytical reagents and ionophores for biological applications. The chemical reactivity of 1,8-dihydroxyl-4,4,5,5-tetramethylbenzo-14-crown-4 had… read more here.
Keywords: reactivity prediction; crown ethers; computational study; reactivity ... See more keywords
Energetics of metal ion adsorption on and diffusion through crown ethers: First principles study on two-dimensional electrolyte
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DOI: 10.1016/j.ssi.2017.01.029
Abstract: Abstract Macrocyclic crown ethers (CEs) have tunable cavity sizes and site-selective binding with metal ions, making the CE-ion complex a promising candidate as a two-dimensional (2D) electrolyte. In this work, density functional theory method is… read more here.
Keywords: diffusion; two dimensional; dimensional electrolyte; ion ... See more keywords
Asymmetric cyclopropanation reactions catalyzed by carbohydrate-based crown ethers
Sign Up to like & getrecommendations! Published in 2018 at "Tetrahedron"
DOI: 10.1016/j.tet.2018.04.087
Abstract: Abstract Optically active cyclopropane derivatives were prepared by a novel, simple and green approach in high enantioselectivities using monosaccharide-based chiral crown ethers as phase transfer catalysts. The crown ethers having d -glucopyranoside, d -mannopyranoside and… read more here.
Keywords: asymmetric cyclopropanation; reactions catalyzed; catalyzed carbohydrate; cyclopropanation reactions ... See more keywords
Synthesis and enantioselective transport studies of both enantiomers of new chiral proton-ionizable crown ethers containing a diarylphosphinic acid unit
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DOI: 10.1016/j.tet.2019.01.039
Abstract: Abstract The synthesis of four new enantiopure crown ethers containing a diarylphosphinic acid unit has been carried out. As a continuation of our work in this field, the enantioselective transport ability of these ligands for… read more here.
Keywords: transport; crown ethers; containing diarylphosphinic; acid unit ... See more keywords
Crown ethers reverse P-glycoprotein-mediated multidrug resistance in cancer cells
Sign Up to like & getrecommendations! Published in 2018 at "Scientific Reports"
DOI: 10.1038/s41598-018-32770-y
Abstract: Multidrug resistance (MDR) is a widespread phenomenon exhibited by many cancers and represents a fundamental obstacle for successful cancer treatments. Tumour cells commonly achieve MDR phenotype through overexpression and/or increased activity of ABC transporters. P-glycoprotein… read more here.
Keywords: mdr; multidrug resistance; cancer; activity ... See more keywords