Journal
ORGANIC LETTERS
Volume 5, Issue 26, Pages 4971-4974Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ol035894h
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[GRAPHICS] A calix[4]arene-derived ditopic receptor 1 has been synthesized. In the absence of Na+, the receptor binds acetate in preference to diphenyl phosphate (as the tetrabutylammonium salts), but in the presence of Na+, the selectivity is reversed and the receptor, instead, binds diphenyl phosphate, and not acetate, which preferentially forms a salt ion-pair in free solution.
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