SCHEDULED MAINTENANCE
Treatment of p-t-butyl-calix[4]arene (1) with t-butyl bromoacetate in tetrahydrofuran–N,N-dimethylfromamide gives, after hydrolysis, a tetracarboxylic acid which exists in a cone structure with an enforced hydrophobic cavity, and whose alkali and ammonium salts are soluble in water.
A. Arduini, A. Pochini, S. Raverberi and R. Ungaro, J. Chem. Soc., Chem. Commun., 1984, 981 DOI: 10.1039/C39840000981
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