Molecular design of crown ethers. VII. Syntheses and cation selectivities of unsubstituted 12-to 16-crown-4.
Y Liu, Y Inoue, T Hakushi
Index: Liu, Yu; Inoue, Yoshihisa; Hakushi, Tadao Bulletin of the Chemical Society of Japan, 1990 , vol. 63, # 10 p. 3044 - 3046
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Citation Number: 33
Abstract
Solvent extraction of aqueous alkali and some heavy metal picrates with the title compounds showed that, with most cations except for Li+, Na+, and Ag+, the extractability decreases monotonically as the ring size increases from 12 to 16. However, 14-crown-4 showed the highest extractability and selectivity for Li+ over the larger alkali metals, while 15-crown-4 exhibited the highest Ag+/TI+ selectivity.
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