Abstract
The introduction of acetic acid units on p. t-butylcalix [4] arene, in a controlled way, leads to a series of new lipophilic complexones (3, 5, 7) with different structures and properties. The tetraacid derivative (3) shows a “cone” structure and its alkali and ammonium salts are soluble in water whereas the other two ligands (5) and (7) show a “flattened cone” structure. All new ligands are able to extract divalent metal cations from water to methylene chloride.
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Ungaro, R., Pochini, A. & Andreetti, G.D. New ionizable ligands from p. t-butylcalix [4] arene. Journal of Inclusion Phenomena 2, 199–206 (1984). https://doi.org/10.1007/BF00663257
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DOI: https://doi.org/10.1007/BF00663257