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Synthesis and Extraction Ability of Some Polyether Bisthioureas and Ureas

L. Kniežo, J. Šťávorská, J. Bernát, J. Imrich, M. Buděšínský, and M. Bělohradský

Department of Organic Chemistry, Faculty of Natural Sciences, P. J. Šafárik University, CS-041 67 Košice


Abstract: For investigations of complexation properties, a series of bisthioureas in which the two thiourea groupings are linked with a polyether chain have been prepared by addition of amines to the corresponding isothiocyanates. The ability of the synthesized compounds to extract metal picrates from aqueous solutions was studied. It was found that, while all the thioureas extracted Ag+ and Cu2+ ions, only some bisthioureas extracted Pb2+ and Cd2+ ions, and some other bisthioureas also relatively well extracted Ca2+ ions. On reaction with 2,4,6-trimethylbenzonitrile oxide, the thioureas were converted into urea derivatives which, however, exhibited practically no extraction ability.

Full paper in Portable Document Format: 473a190.pdf


Chemical Papers 47 (3) 190–194 (1993)

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