New ionizable ligands from p. t-butylcalix [4] arene |
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| Authors: | R Ungaro A Pochini G D Andreetti |
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| Institution: | (1) Institute of Organic Chemistry of the University, Via Massimo D'Azeglio 85, 43100 Parma, Italy;(2) Institute of Structural Chemistry of the University, Via Massimo D'Azeglio 85, 43100 Parma, Italy |
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| 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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