Calix Crowns Derived from para-Bridged Calix[4]arenes
- 17 February 2000
- journal article
- Published by American Chemical Society (ACS) in Organic Letters
- Vol. 2 (6) , 839-841
- https://doi.org/10.1021/ol005581b
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.Keywords
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