Enantioselective complexation of phenolic crown ethers with chiral aminoethanol derivatives: effects of substituents of aromatic rings of hosts and guests on complexation †

Autor:	Koichiro Naemura, Kazuko Ogasahara, Kazuyuki Nishioka, Yoshito Tobe, Keiji Hirose
Rok vydání:	2000
Předmět:	chemistry.chemical_compound Chloroform chemistry Polymer chemistry Proton NMR Enantioselective synthesis Aromaticity Titration macromolecular substances Optically active
Zdroj:	Scopus-Elsevier
ISSN:	1364-5471 1470-1820
DOI:	10.1039/a910171n
Popis:	Optically active azophenolic crown ethers having phenyl groups substituted at the respective para-position were prepared and their association constants with chiral aminoethanol derivatives, including 2-amino-2-phenylethanols having an electron-donating or an electron-withdrawing group, were determined in chloroform by means of UV-vis titration methods. The enantioselectivities of these crown ethers are estimated from the ratio of the association constants KR/KS and the effect of aromatic substituents of both hosts and guests on the binding abilities and enantioselectivities is discussed. The structures of the complexes were investigated on the basis of the 1H NMR and UV-vis spectra.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::33337ca67703d79cd20af2144c395482 https://doi.org/10.1039/a910171n Zobrazit plný text záznamu