1,3-DIALKYL-2-IMIDAZOLIDINETHIONES AND SOME OF THEIR PROPERTIES

A single-stage method for the synthesis of dialkyl derivatives of 2-im idazolidinethione is developed, which consists of treating 2-imidazoli dinethione with alkyl halides in the presence of caustic potash in an atmosphere of dimethyl sulfoxide at 20-50-degrees-C. Thus, 1, 3-di-n-a myl-2-imidazolidinethione, 1, 4-di-n-amylethylenediamine-4-thioaldehyd e, 1,3-di-n-butylthioethyl-2-imidazolidinethione, butylthioethyl-1,4-e thylenediamine-4-thioaldehyde, 1,3-diisobutylthioethyl-2-imidazolidine thione, and 2,12-dimethyl-4,7,10-trithiatridecane are produced. The co mpounds prepared are tested as extracting agents of noble metals, part icularly during the extraction of silver from solutions of AgNO3 in H2 O and in AgNO3, as well as for purification of wastewater of technolog ical processes from silver. We can recommend them for a complete extra ction of silver from wastewater.