26,28-(Dibutylcarbamoyl)methoxy-5,11,17,23-tert-butylcalix[4]arene and two geometric isomers of 27,28-(dibutylcarbamoyl)methoxy-5,11,17,23-tert-butylcalix[4]arene have been used to extract UVI, MoVI, CrVI and SeVI from aqueous solution into toluene or isooctane.
O. M. Falana, H. Fred Koch, D. Max Roundhill, O. M. Falana, G. J. Lumetta and B. P. Hay, Chem. Commun., 1998, 503 DOI: 10.1039/A707786F
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