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Synthesis and alkali metal picrate extraction capabilities of novel, cage-functionalized diazacrown ethers. Effects of host preorganization on avidity and selectivity toward alkali metal picrates in solution

✍ Scribed by Alan P. Marchand; Artie S. McKim; Kaipenchery A. Kumar

Book ID
104208882
Publisher
Elsevier Science
Year
1998
Tongue
French
Weight
401 KB
Volume
54
Category
Article
ISSN
0040-4020

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✦ Synopsis

The synthesis of a series of cage-functionalized bis(monoazacrown) ethers and bis(diazacrown) ethers is described. Alkali metal picrate extraction profiles have been determined for several members of this novel series of ionophores. The increased level of preorganization achieved when a cagefunctionalized bis(diaza-crown) ether is incorporated into a "molecular box" results in higher levels of avidity and selectivity of the resulting host system toward alkali metal picrates in solution.

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The syntheses of novel cage-functionalized crown ethers, It-t3, that contain one or more pyridyl units are reported. The results of alkali metal picrate extraction experiments performed by using 1 i and 12 are compared with those obtained by using the corresponding model (non-cage) crown ethers. Cag