Chiral 1,2,3-Triazoliums as New Cationic Organic Catalysts with Anion-Recognition Ability: Application to Asymmetric Alkylation of Oxindoles

2011 ◽  
Vol 133 (5) ◽  
pp. 1307-1309 ◽  
Author(s):  
Kohsuke Ohmatsu ◽  
Mari Kiyokawa ◽  
Takashi Ooi
Keyword(s):  
Anion Recognition ◽  
Asymmetric Alkylation ◽  
Recognition Ability ◽  
Organic Catalysts

scholarly journals Synthesis of per(5-N-carboxamide-5-dehydroxylmethyl)-β-cyclodextrins and their selective recognition ability utilizing multiple hydrogen bonds

2019 ◽  
Vol 55 (27) ◽  
pp. 3872-3875 ◽  
Author(s):  
Takashi Nakamura ◽  
Sota Yonemura ◽  
Tatsuya Nabeshima
Keyword(s):  
Hydrogen Bonds ◽  
Functional Groups ◽  
Anion Recognition ◽  
Binding Mode ◽  
Selective Recognition ◽  
Recognition Ability ◽  
Multiple Hydrogen Bonds

An amide cyclodextrin with anion recognition ability exhibits unique binding mode in which unsymmetrically arranged functional groups play distinctive roles.

Orientation of the α-CD component of [2]rotaxanes affects their specific molecular recognition behaviour

2021 ◽  
Author(s):  
Takuya Iwamoto ◽  
Shinobu Miyagawa ◽  
Masaya Naito ◽  
Yuji Tokunaga
Keyword(s):  
Molecular Recognition ◽  
Anion Recognition ◽  
Oh Groups ◽  
Recognition Ability ◽  
Phenol Moiety

An α-CD component enhanced the anion recognition ability of the urea moiety and the deprotonation of the phenol moiety in the axle component in orientationally isomeric [2]rotaxanes with the OH groups on the wide rim of the α-CD, respectively.

scholarly journals Development of copper-catalyzed enantioselective decarboxylative aldolization for the preparation of perfluorinated 1,3,5-triols featuring supramolecular recognition properties

2020 ◽  
Vol 11 (6) ◽  
pp. 1629-1635 ◽  
Author(s):  
Céline Sperandio ◽  
Jean Rodriguez ◽  
Adrien Quintard
Keyword(s):  
Anion Recognition ◽  
Recognition Ability ◽  
One Step

An enantioselective aldolization on perfluorinated aldehydes has been developed. The reaction can create in one step ketodiols, precursors of crucial perfluorinated 1,3,5-triols featuring selective chiral anion recognition ability.

scholarly journals Chiral anion recognition using calix[4]arene-based ureido receptors in a 1,3-alternate conformation

2020 ◽  
Vol 16 ◽  
pp. 2999-3007
Author(s):  
Tereza Horáčková ◽  
Jan Budka ◽  
Vaclav Eigner ◽  
Wen-Sheng Chung ◽  
Petra Cuřínová ◽  
...  
Keyword(s):  
Single Crystal ◽  
Chiral Recognition ◽  
Anion Recognition ◽  
Selectivity Factor ◽  
Nmr Titration ◽  
X Ray ◽  
H Nmr ◽  
Recognition Ability

The introduction of chiral alkyl substituents into the lower rim of calix[4]arene immobilised in the 1,3-alternate conformation led to a system possessing a preorganised ureido cavity hemmed with chiral alkyl units in the near proximity. As shown by the 1H NMR titration experiments, these compounds can be used as receptors for chiral anions in DMSO-d 6. The chiral recognition ability can be further strengthened by the introduction of another chiral moiety directly onto the urea N atoms. The systems with double chiral units being located around the binding ureido cavity showed better stereodiscrimination, with the highest selectivity factor being 3.33 (K L/K D) achieved for N-acetyl-ʟ-phenylalaninate. The structures of some receptors were confirmed by single crystal X-ray analysis.

A diquat-containing macrocyclic anion acceptor in pure water

2019 ◽  
Vol 55 (57) ◽  
pp. 8297-8300 ◽  
Author(s):  
Ye Lei ◽  
Libo Shen ◽  
Ji-Ren Liu ◽  
Tianyu Jiao ◽  
Yang Zhang ◽  
...  
Keyword(s):  
Pure Water ◽  
Anion Recognition ◽  
High Yield ◽  
Recognition Ability ◽  
Self Assembled

A self-assembled diquat-containing tetracationic macrocycle is obtained in a high yield, which demonstrates its anion recognition ability in pure water.

Anion recognition ability of a novel azo dye derived from 4-hydroxycoumarin

2014 ◽  
Vol 154 ◽  
pp. 515-519 ◽  
Author(s):  
Madhurya Chandel ◽  
Sutapa Mondal Roy ◽  
Darshna Sharma ◽  
Suban K. Sahoo ◽  
Amit Patel ◽  
...  
Keyword(s):  
Azo Dye ◽  
Anion Recognition ◽  
Recognition Ability
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