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Paper | Regular issue | Vol 60, No. 1, 2003, pp.113-119
Published online, 25th November, 2002
DOI: 10.3987/COM-02-9627
■ Synthesis and Extraction Propertieis of New Bis-crown Ethers Derived from Stereoisomer of 1,2-Cyclohexanediols for Alkali Metal Cations

Seyed Mohammad Seyedi,* Ali Gouran, and Tahereh Malekshah

*Department of Chemistry, Faculty of Sciences, Ferdowsi University of Mashhad, Mashhad, 91775, Iran

Abstract

Stereoisomers of new bis(benzo-15-crown-5) derivatives were synthesized from cis- and trans-1,2-cyclohexanediols. The complexing ability of these bis-crown ethers toward sodium, potassium, lithium, calcium, and magnesium cations has been measured by the solvent extraction method. The extraction data show that the extractabilities of these cations are increased due to the formation of “sandwich-type” complexes by the cis-isomer. The results also show that steric hindrance of substituent on the benzene rings does not have any interference with the formation of a sandwich-type complex in the cis-form.