title: Calix Crowns Derived from para-Bridged Calix
abstract: Two calix[4]arenes, bridged by aliphatic chains of five and eight carbon atoms spanning two opposite para positions, have been converted into their 1,3-crown ether derivatives by reaction with tetraethylene and pentaethylene glycol ditosylates. Of the two possible 1,3-crown derivatives, only the formation of those isomers is observed in which the phenolic units connected at the para positions are etherified. This has been established in one case by a single-crystal X-ray analysis. Preliminary results for the extraction of selected alkali and alkaline-earth metals are reported.
authors.affiliation: Institut für Anorganische Chemie der Technischen Universität, Mommsenstrasse 13, D-01062 Dresden, Germany, Hoechst Marion Roussel, D-65926 Frankfurt/Main, Germany, and Fachbereich Chemie und Pharmazie, Abteilung Lehramt Chemie, Johannes Gutenberg-Universität, Duesbergweg 10-14, D-55099 Mainz, Germany.
authors.initials: H
authors.lastname: Stephan
authors.initials: K
authors.lastname: Gloe
authors.initials: EF
authors.lastname: Paulus
authors.initials: M
authors.lastname: Saadioui
authors.initials: V
authors.lastname: Böhmer