Condensation of 4,6-bis(chloromethyl)-2,5-dimethoxytropone with di- and tri-ethylene glycol bis(2-mercaptoethyl) ethers gave dithio-crown ethers, which selectively included Hg2+ from aqueous solutions; the Hg2+ included was quantitatively liberated by acidification with dilute HCl, thus achieving an effective transportation of Hg2+.
H. Takeshita, A. Mori and S. Hirayama, J. Chem. Soc., Chem. Commun., 1989, 564 DOI: 10.1039/C39890000564
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