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New lipophilic crown ethers with intraannular carboxylic acid groups: Synthesis and alkali metal cation extraction

✍ Scribed by Larry D. Bratton; Hwang Huh; Richard A. Bartsch

Publisher
Journal of Heterocyclic Chemistry
Year
2000
Tongue
English
Weight
410 KB
Volume
37
Category
Article
ISSN
0022-152X

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✦ Synopsis

Abstract

A six‐step synthetic route to four lipophilic crown ethers with intraannular carboxylic acid groups and ring sizes of 15‐crown‐4, 18‐crown‐5, 21‐crown‐6 and 24‐crown‐7 is described. Eight new polyether compounds that bear inward‐facing bromo and formate ester substituents are prepared as synthetic intermediates. Selectivities and efficiencies of the four new lipophilic crown ether carboxylic acids in competitive alkali metal cation extraction from aqueous solutions into chloroform are evaluated.

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Synthesis, alkali metal picrate extracti
Synthesis, alkali metal picrate extraction, and alkali metal cation binding selectivities of some new cage-annulated polyoxamacrocyclic crown ethers
✍ Alan P. Marchand; Zilin Huang; Zhibing Chen; H. K. Hariprakasha; I. N. N. Namboo πŸ“‚ Article πŸ“… 2001 πŸ› Journal of Heterocyclic Chemistry 🌐 English βš– 84 KB πŸ‘ 1 views

## Abstract Five new cage‐annulated crown ethers, __i.e.__, 4a, 4b, 6b, 11a, and 11b, have been synthesized and their respective alkali metal picrate extraction profiles along with that of a previously synthesized host molecule, 6a, have been obtained. These results are compared with the correspond