Journal
TETRAHEDRON LETTERS
Volume 41, Issue 24, Pages 4815-4818Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0040-4039(00)00729-2
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Several 1,4-bridged calix[6]arene tetraesters were prepared from 1,4-p-tert-calix[6]crown-4's by etherifying with ethyl bromoacetate. It was found that the 1,4-p-tert-calix[6]crown-4 tetraethylester (3a) and the 1,4-p-tert-calix[6]benzocrown-4 tetramethylester (4b) exhibit very high selectivity toward lithium and sodium ions, respectively. The ion selectivity is very sensitive to the structure of polyoxyethylene spacer and the R in the ester moiety. (C) 2000 Elsevier Science Ltd. All rights reserved.
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